Role of Broken Gauge Symmetry in Transport Phenomena Involving Neutral and Charged Particle
岩石混凝土损伤力学英文名著
岩石混凝土损伤力学英文名著In the realm of civil engineering and materials science, the study of rock and concrete damage mechanics is a critical field that has garnered significant attention. This branch of science delves into the understanding of the behavior of rock and concrete materials under various stress conditions, leading to their eventual failure or damage.Rock and concrete, being widely utilized in construction, are subjected to a plethora of forces and environmental conditions that can induce damage. The mechanics of this damage involve complex processes such as cracking, spalling, and fragmentation, which are influenced by the material's microstructure, stress history, and environmental exposure.One of the seminal works in this field is the research conducted by Professor H.H. Einstein, who developed a comprehensive model for the fracture process in rock. His work, which is extensively referenced in the literature, provides a theoretical framework for predicting the onset and progression of fractures in rock materials.In addition, the development of numerical models and simulation tools has been instrumental in advancing the understanding of damage mechanics in concrete. These models, such as the finite element method (FEM), allow engineers to simulate the behavior of concrete under various loading conditions, thereby predicting the onset of damage and thepotential for structural failure.Moreover, the incorporation of non-destructive testing (NDT) techniques has been vital in assessing the integrity of rock and concrete structures. Techniques such as ultrasonic testing, ground-penetrating radar, and acoustic emission monitoring provide valuable insights into the internal condition of these materials, identifying areas of potential weakness before catastrophic failure occurs.The study of rock and concrete damage mechanics is not only confined to theoretical and computational models. Experimental research plays a crucial role in validating these models and understanding the real-world behavior of these materials. Laboratories worldwide conduct a variety of tests, including uniaxial and triaxial compression tests, tensile tests, and fatigue tests, to study the response of rock and concrete to different types of stress.In conclusion, the study of rock and concrete damage mechanics is a multifaceted discipline that combines theoretical knowledge, computational modeling, and experimental research to enhance our understanding of material behavior under stress. This knowledge is essential for the design and maintenance of safe and durable structures in the built environment.。
symmetric 名词
Symmetric1. IntroductionSymmetric is a term used in mathematics and other fields to describe objects or concepts that possess a certain type of symmetry. In mathematics, symmetry refers to a property where an object remains unchanged under certain transformations, such as reflection, rotation, or translation. In this article, we will explore the concept of symmetry and its various applications in different disciplines.2. Symmetry in MathematicsSymmetry plays a fundamental role in mathematics and is widely studied in various branches, including geometry, algebra, and group theory. In geometry, symmetric objects are those that can be divided into two or more parts that are mirror images of each other. For example, a circle is symmetric with respect to any line passing through its center.Symmetry can also be observed in patterns and shapes. Regular polygons such as squares and equilateral triangles possess rotational symmetry because they can be rotated by certain angles without changing their appearance. Fractals, which are intricate mathematical patterns that repeat at different scales, often exhibit self-similarity and possess various types of symmetries.In algebra, symmetry is explored through the concept of functions. A function is said to be symmetric if it satisfies the condition f(x) =f(-x) for all values of x in its domain. This property implies that the graph of the function is symmetric with respect to the y-axis.Group theory provides a rigorous framework for studying symmetry by defining mathematical structures called groups. A group consists of a set of elements and an operation that combines two elements to produce another element in the set. Symmetry groups describe all possible symmetries of an object or system and play a vital role in understanding its properties.3. Symmetry in PhysicsSymmetry has profound implications in physics and is essential for understanding the laws of nature. The principle of symmetry lies at theheart of many fundamental theories, such as classical mechanics, quantum mechanics, and general relativity.In classical mechanics, the conservation of angular momentum is a consequence of rotational symmetry. The laws of motion remain the same regardless of the direction in which an object is oriented. This symmetry is evident in everyday life, where the behavior of objects under different orientations follows consistent patterns.In quantum mechanics, symmetry plays a crucial role in determining the behavior of particles and their interactions. The principles of quantum field theory rely heavily on the concept of gauge symmetry, which describes the invariance of physical laws under certain transformations. Symmetries such as time translation symmetry and particle-antiparticle symmetry are fundamental to our understanding of elementary particles and their interactions.General relativity, Einstein’s theory of gravity, incorporates the principle of general covariance, which states that physical laws should be independent of the choice of coordinates. This symmetry reflects the idea that space and time are not absolute but rather depend on the observer’s frame of reference.4. Symmetry in BiologySymmetry is prevalent in biology and plays a crucial role in understanding various biological processes and structures. Many organisms exhibit bilateral symmetry, where their bodies can be divided into two mirror-image halves along a plane. This type of symmetry is observed in animals ranging from insects to mammals.Bilateral symmetry provides advantages such as improved mobility and sensory perception. It allows for efficient movement by dividing body parts into corresponding pairs such as legs or wings. It alsofacilitates better coordination between sensory organs located on opposite sides of an organism.Symmetry is also observed at smaller scales within organisms. For example, DNA molecules possess helical symmetry due to their double-stranded structure. Proteins often exhibit internal symmetries that influence their folding patterns and functions.Studying symmetric patterns in nature can provide insights into evolutionary processes and ecological relationships between differentspecies. Understanding how symmetrical structures arise and function can help biologists unravel complex biological systems.5. Symmetry in Art and DesignSymmetry has been a fundamental principle in art and design for centuries. Artists and designers often use symmetrical patterns and compositions to create aesthetically pleasing and visually balanced works.Symmetry can be found in various art forms, including painting, sculpture, architecture, and textiles. The use of bilateral symmetry can create a sense of harmony and orderliness. Radial symmetry, where elements are arranged around a central point, is also frequently employed to achieve balance and visual interest.In modern design, the concept of symmetry has evolved to include asymmetrical compositions as well. Asymmetry introduces a dynamic element by intentionally breaking traditional symmetrical arrangements. This approach adds visual tension and can create a more engaging and thought-provoking experience for the viewer.6. ConclusionSymmetry is a fascinating concept that permeates many aspects of our world, from mathematics to physics, biology, and art. It represents an inherent orderliness and balance that is both aesthetically pleasing and intellectually stimulating.The study of symmetry has led to significant advancements in various fields, providing insights into the fundamental laws of nature, the structure of biological systems, and the principles of design. By understan ding symmetry’s underlying principles and exploring its applications, we gain a deeper appreciation for the intricate patterns that surround us.。
常用焊接中英文词典汇总
常用术语中英文词典A-DAbsolute deviation, 绝对离差Absolute number, 绝对数Absolute residuals, 绝对残差Acceleration array, 加速度立体阵Acceleration in an arbitrary direction, 任意方向上的加速度Acceleration normal, 法向加速度Acceleration space dimension, 加速度空间的维数Acceleration tangential, 切向加速度Acceleration vector, 加速度向量Acceptable hypothesis, 可接受假设Accumulation, 累积Accuracy, 准确度Actual frequency, 实际频数Adaptive estimator, 自适应估计量Addition, 相加Addition theorem, 加法定理Additivity, 可加性Adjusted rate, 调整率Adjusted value, 校正值Admissible error, 容许误差Aggregation, 聚集性Alternative hypothesis, 备择假设Among groups, 组间Amounts, 总量Analysis of correlation, 相关分析Analysis of covariance, 协方差分析Analysis of regression, 回归分析Analysis of time series, 时间序列分析Analysis of variance, 方差分析Angular transformation, 角转换ANOVA （analysis of variance）, 方差分析ANOVA Models, 方差分析模型Arcing, 弧/弧旋Arcsine transformation, 反正弦变换Area under the curve, 曲线面积AREG , 评估从一个时间点到下一个时间点回归相关时的误差ARIMA, 季节和非季节性单变量模型的极大似然估计Arithmetic grid paper, 算术格纸Arithmetic mean, 算术平均数Arrhenius relation, 艾恩尼斯关系Assessing fit, 拟合的评估Associative laws, 结合律Asymmetric distribution, 非对称分布Asymptotic bias, 渐近偏倚Asymptotic efficiency, 渐近效率Asymptotic variance, 渐近方差Attributable risk, 归因危险度Attribute data, 属性资料Attribution, 属性Autocorrelation, 自相关Autocorrelation of residuals, 残差的自相关Average, 平均数Average confidence interval length, 平均置信区间长度Average growth rate, 平均增长率Bar chart, 条形图Bar graph, 条形图Base period, 基期Bayes' theorem , Bayes定理Bell-shaped curve, 钟形曲线Bernoulli distribution, 伯努力分布Best-trim estimator, 最好切尾估计量Bias, 偏性Binary logistic regression, 二元逻辑斯蒂回归Binomial distribution, 二项分布Bisquare, 双平方Bivariate Correlate, 二变量相关Bivariate normal distribution, 双变量正态分布Bivariate normal population, 双变量正态总体Biweight interval, 双权区间Biweight M-estimator, 双权M估计量Block, 区组/配伍组BMDP(Biomedical computer programs), BMDP统计软件包Boxplots, 箱线图/箱尾图Breakdown bound, 崩溃界/崩溃点Canonical correlation, 典型相关Caption, 纵标目Case-control study, 病例对照研究Categorical variable, 分类变量Catenary, 悬链线Cauchy distribution, 柯西分布Cause-and-effect relationship, 因果关系Cell, 单元Censoring, 终检Center of symmetry, 对称中心Centering and scaling, 中心化和定标Central tendency, 集中趋势Central value, 中心值CHAID -χ2 Automatic Interaction Detector, 卡方自动交互检测Chance, 机遇Chance error, 随机误差Chance variable, 随机变量Characteristic equation, 特征方程Characteristic root, 特征根Characteristic vector, 特征向量Chebshev criterion of fit, 拟合的切比雪夫准则Chernoff faces, 切尔诺夫脸谱图Chi-square test, 卡方检验/χ2检验Choleskey decomposition, 乔洛斯基分解Circle chart, 圆图Class interval, 组距Class mid-value, 组中值Class upper limit, 组上限Classified variable, 分类变量Cluster analysis, 聚类分析Cluster sampling, 整群抽样Code, 代码Coded data, 编码数据Coding, 编码Coefficient of contingency, 列联系数Coefficient of determination, 决定系数Coefficient of multiple correlation, 多重相关系数Coefficient of partial correlation, 偏相关系数Coefficient of production-moment correlation, 积差相关系数Coefficient of rank correlation, 等级相关系数Coefficient of regression, 回归系数Coefficient of skewness, 偏度系数Coefficient of variation, 变异系数Cohort study, 队列研究Column, 列Column effect, 列效应Column factor, 列因素Combination pool, 合并Combinative table, 组合表Common factor, 共性因子Common regression coefficient, 公共回归系数Common value, 共同值Common variance, 公共方差Common variation, 公共变异Communality variance, 共性方差Comparability, 可比性Comparison of bathes, 批比较Comparison value, 比较值Compartment model, 分部模型Compassion, 伸缩Complement of an event, 补事件Complete association, 完全正相关Complete dissociation, 完全不相关Complete statistics, 完备统计量Completely randomized design, 完全随机化设计Composite event, 联合事件Composite events, 复合事件Concavity, 凹性Conditional expectation, 条件期望Conditional likelihood, 条件似然Conditional probability, 条件概率Conditionally linear, 依条件线性Confidence interval, 置信区间Confidence limit, 置信限Confidence lower limit, 置信下限Confidence upper limit, 置信上限Confirmatory Factor Analysis , 验证性因子分析Confirmatory research, 证实性实验研究Confounding factor, 混杂因素Conjoint, 联合分析Consistency, 相合性Consistency check, 一致性检验Consistent asymptotically normal estimate, 相合渐近正态估计Consistent estimate, 相合估计Constrained nonlinear regression, 受约束非线性回归Constraint, 约束Contaminated distribution, 污染分布Contaminated Gausssian, 污染高斯分布Contaminated normal distribution, 污染正态分布Contamination, 污染Contamination model, 污染模型Contingency table, 列联表Contour, 边界线Contribution rate, 贡献率Control, 对照Controlled experiments, 对照实验Conventional depth, 常规深度Convolution, 卷积Corrected factor, 校正因子Corrected mean, 校正均值Correction coefficient, 校正系数Correctness, 正确性Correlation coefficient, 相关系数Correlation index, 相关指数Correspondence, 对应Counting, 计数Counts, 计数/频数Covariance, 协方差Covariant, 共变Cox Regression, Cox回归Criteria for fitting, 拟合准则Criteria of least squares, 最小二乘准则Critical ratio, 临界比Critical region, 拒绝域Critical value, 临界值Cross-over design, 交叉设计Cross-section analysis, 横断面分析Cross-section survey, 横断面调查Crosstabs , 交叉表Cross-tabulation table, 复合表Cube root, 立方根Cumulative distribution function, 分布函数Cumulative probability, 累计概率Curvature, 曲率/弯曲Curvature, 曲率Curve fit , 曲线拟和Curve fitting, 曲线拟合Curvilinear regression, 曲线回归Curvilinear relation, 曲线关系Cut-and-try method, 尝试法Cycle, 周期Cyclist, 周期性D test, D检验Data acquisition, 资料收集Data bank, 数据库Data capacity, 数据容量Data deficiencies, 数据缺乏Data handling, 数据处理Data manipulation, 数据处理Data processing, 数据处理Data reduction, 数据缩减Data set, 数据集Data sources, 数据来源Data transformation, 数据变换Data validity, 数据有效性Data-in, 数据输入Data-out, 数据输出Dead time, 停滞期Degree of freedom, 自由度Degree of precision, 精密度Degree of reliability, 可靠性程度Degression, 递减Density function, 密度函数Density of data points, 数据点的密度Dependent variable, 应变量/依变量/因变量Dependent variable, 因变量Depth, 深度Derivative matrix, 导数矩阵Derivative-free methods, 无导数方法Design, 设计Determinacy, 确定性Determinant, 行列式Determinant, 决定因素Deviation, 离差Deviation from average, 离均差Diagnostic plot, 诊断图Dichotomous variable, 二分变量Differential equation, 微分方程Direct standardization, 直接标准化法Discrete variable, 离散型变量DISCRIMINANT, 判断Discriminant analysis, 判别分析Discriminant coefficient, 判别系数Discriminant function, 判别值Dispersion, 散布/分散度Disproportional, 不成比例的Disproportionate sub-class numbers, 不成比例次级组含量Distribution free, 分布无关性/免分布Distribution shape, 分布形状Distribution-free method, 任意分布法Distributive laws, 分配律Disturbance, 随机扰动项Dose response curve, 剂量反应曲线Double blind method, 双盲法Double blind trial, 双盲试验Double exponential distribution, 双指数分布Double logarithmic, 双对数Downward rank, 降秩Dual-space plot, 对偶空间图DUD, 无导数方法Duncan's new multiple range method, 新复极差法/Duncan新法E-LEffect, 实验效应Eigenvalue, 特征值Eigenvector, 特征向量Ellipse, 椭圆Empirical distribution, 经验分布Empirical probability, 经验概率单位Enumeration data, 计数资料Equal sun-class number, 相等次级组含量Equally likely, 等可能Equivariance, 同变性Error, 误差/错误Error of estimate, 估计误差Error type I, 第一类错误Error type II, 第二类错误Estimand, 被估量Estimated error mean squares, 估计误差均方Estimated error sum of squares, 估计误差平方和Euclidean distance, 欧式距离Event, 事件Event, 事件Exceptional data point, 异常数据点Expectation plane, 期望平面Expectation surface, 期望曲面Expected values, 期望值Experiment, 实验Experimental sampling, 试验抽样Experimental unit, 试验单位Explanatory variable, 说明变量Exploratory data analysis, 探索性数据分析Explore Summarize, 探索-摘要Exponential curve, 指数曲线Exponential growth, 指数式增长EXSMOOTH, 指数平滑方法Extended fit, 扩充拟合Extra parameter, 附加参数Extrapolation, 外推法Extreme observation, 末端观测值Extremes, 极端值/极值F distribution, F分布F test, F检验Factor, 因素/因子Factor analysis, 因子分析Factor Analysis, 因子分析Factor score, 因子得分Factorial, 阶乘Factorial design, 析因试验设计False negative, 假阴性False negative error, 假阴性错误Family of distributions, 分布族Family of estimators, 估计量族Fanning, 扇面Fatality rate, 病死率Field investigation, 现场调查Field survey, 现场调查Finite population, 有限总体Finite-sample, 有限样本First derivative, 一阶导数First principal component, 第一主成分First quartile, 第一四分位数Fisher information, 费雪信息量Fitted value, 拟合值Fitting a curve, 曲线拟合Fixed base, 定基Fluctuation, 随机起伏Forecast, 预测Four fold table, 四格表Fourth, 四分点Fraction blow, 左侧比率Fractional error, 相对误差Frequency, 频率Frequency polygon, 频数多边图Frontier point, 界限点Function relationship, 泛函关系Gamma distribution, 伽玛分布Gauss increment, 高斯增量Gaussian distribution, 高斯分布/正态分布Gauss-Newton increment, 高斯-牛顿增量General census, 全面普查GENLOG (Generalized liner models), 广义线性模型Geometric mean, 几何平均数Gini's mean difference, 基尼均差GLM (General liner models), 通用线性模型Goodness of fit, 拟和优度/配合度Gradient of determinant, 行列式的梯度Graeco-Latin square, 希腊拉丁方Grand mean, 总均值Gross errors, 重大错误Gross-error sensitivity, 大错敏感度Group averages, 分组平均Grouped data, 分组资料Guessed mean, 假定平均数Half-life, 半衰期Hampel M-estimators, 汉佩尔M估计量Happenstance, 偶然事件Harmonic mean, 调和均数Hazard function, 风险均数Hazard rate, 风险率Heading, 标目Heavy-tailed distribution, 重尾分布Hessian array, 海森立体阵Heterogeneity, 不同质Heterogeneity of variance, 方差不齐Hierarchical classification, 组内分组Hierarchical clustering method, 系统聚类法High-leverage point, 高杠杆率点HILOGLINEAR, 多维列联表的层次对数线性模型Hinge, 折叶点Histogram, 直方图Historical cohort study, 历史性队列研究Holes, 空洞HOMALS, 多重响应分析Homogeneity of variance, 方差齐性Homogeneity test, 齐性检验Huber M-estimators, 休伯M估计量Hyperbola, 双曲线Hypothesis testing, 假设检验Hypothetical universe, 假设总体Impossible event, 不可能事件Independence, 独立性Independent variable, 自变量Index, 指标/指数Indirect standardization, 间接标准化法Individual, 个体Inference band, 推断带Infinite population, 无限总体Infinitely great, 无穷大Infinitely small, 无穷小Influence curve, 影响曲线Information capacity, 信息容量Initial condition, 初始条件Initial estimate, 初始估计值Initial level, 最初水平Interaction, 交互作用Interaction terms, 交互作用项Intercept, 截距Interpolation, 内插法Interquartile range, 四分位距Interval estimation, 区间估计Intervals of equal probability, 等概率区间Intrinsic curvature, 固有曲率Invariance, 不变性Inverse matrix, 逆矩阵Inverse probability, 逆概率Inverse sine transformation, 反正弦变换Iteration, 迭代Jacobian determinant, 雅可比行列式Joint distribution function, 分布函数Joint probability, 联合概率Joint probability distribution, 联合概率分布K means method, 逐步聚类法Kaplan-Meier, 评估事件的时间长度Kaplan-Merier chart, Kaplan-Merier图Kendall's rank correlation, Kendall等级相关Kinetic, 动力学Kolmogorov-Smirnove test, 柯尔莫哥洛夫-斯米尔诺夫检验Kruskal and Wallis test, Kruskal及Wallis检验/多样本的秩和检验/H检验Kurtosis, 峰度Lack of fit, 失拟Ladder of powers, 幂阶梯Lag, 滞后Large sample, 大样本Large sample test, 大样本检验Latin square, 拉丁方Latin square design, 拉丁方设计Leakage, 泄漏Least favorable configuration, 最不利构形Least favorable distribution, 最不利分布Least significant difference, 最小显著差法Least square method, 最小二乘法Least-absolute-residuals estimates, 最小绝对残差估计Least-absolute-residuals fit, 最小绝对残差拟合Least-absolute-residuals line, 最小绝对残差线Legend, 图例L-estimator, L估计量L-estimator of location, 位置L估计量L-estimator of scale, 尺度L估计量Level, 水平Life expectance, 预期期望寿命Life table, 寿命表Life table method, 生命表法Light-tailed distribution, 轻尾分布Likelihood function, 似然函数Likelihood ratio, 似然比line graph, 线图Linear correlation, 直线相关Linear equation, 线性方程Linear programming, 线性规划Linear regression, 直线回归Linear Regression, 线性回归Linear trend, 线性趋势Loading, 载荷Location and scale equivariance, 位置尺度同变性Location equivariance, 位置同变性Location invariance, 位置不变性Location scale family, 位置尺度族Log rank test, 时序检验Logarithmic curve, 对数曲线Logarithmic normal distribution, 对数正态分布Logarithmic scale, 对数尺度Logarithmic transformation, 对数变换Logic check, 逻辑检查Logistic distribution, 逻辑斯特分布Logit transformation, Logit转换LOGLINEAR, 多维列联表通用模型Lognormal distribution, 对数正态分布Lost function, 损失函数Low correlation, 低度相关Lower limit, 下限Lowest-attained variance, 最小可达方差LSD, 最小显著差法的简称Lurking variable, 潜在变量。
Lie algebras, in Infinite-dimensional Lie algebras and groups, Adv. Ser. in Math. Phys. 7,
C1;1;k g ' L0;k (0)
L1;k (1)
M1;k (1): Combining Theorem 4.6 and the statement (ii), we obtain the statement (i). Q.E.D.
References
H0 (g(0; 1; 1); L0 ;k (0)
Department of Mathematics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan. Department of Mathematics, Faculty of Science, Osaka University,
[KK] Kac V.G. and Kazhdan D.A., Structure of representations with highest weight of in nite dimensional Lie algebras, Adv. in Math. 34, (1979), 97{108. [KnPZ] Knizhnik V. G., Polyakov A. M. and Zamolodchikov A.B., Fractal structure in 2D quantum gravity, Mod. Phys. Lett. A 3, (1988), 819{826. [KW1] Kac V.G. and Wakimoto M., Modular invariant representations of in nite dimensional Lie algebras and superalgebras, Proc. Natl. Acad. Soc., 35, (1988), 4956{4960. [KW2] Kac V.G. and Wakimoto M., Classi cation of modular invariant representations of ane Lie algebras, in In nite-dimensional Lie algebras and groups, Adv. Ser. in Math. Phys. 7, (1989), 138{177. [KWn] Kac V. G. and Wang W., Vertex operator superalgebras and their representations, Mathematical aspects of conformal and topological eld theories and quantum groups, 161{191, Contemp. Math. 175, Amer. Math. Soc. Providence, RI, (1994). [Mal] Malikov F.G., Verma modules over Kac-Moody algebras of rank 2, Leningrad Math. J., 2, No. 2, (1991), 269{286. [MFF] Malikov F.G., Feigin B.L. and Fuks D.B., Singular vectors in Verma modules over KacMoody algebras, Funkts. Anal. Prilozhen., 20, No. 2, (1988), 25{37. [MW] Mathieu P. and Walton M.A., Fractional-level Kac-Moody Algebras and Nonunitary Coset Conformal Theories, Prog. Theor. Phys. 102, (1990), 229-254. [MP] Moody R.V. and Pianzola A., Lie algebras with triangular decompositions, Wiley-Interscience Publ., New York, 1995. [P] Polyakov A. M., Quantum Gravity in two dimensions, Mod. Phys. Lett. A 2, (1987), 893-898. [Ray] Ray U., A Characterization of Lie superalgebras for a certain class of graded Lie superalgebras, preprint,to appear in Jour. Alg. [RW] Rocha-Caridi A. and Wallach N.R., Highest weight modules over graded Lie algebras: resolutions, ltrations and character formulas, Trans. Amer. Math. Soc. 20, (1983), 133{162. [TUY] Tsuchiya A., Ueno K. and Yamada Y., Conformal eld theory on moduli family of stable curves with gauge symmetry, in Integrable systems in quantum eld theory and statistical mechanics, Adv. Stud. Pure Math. 19, (1989), 459-566. [V] Verlinde E., Fusion rules and modular transformations in 2D conformal eld theory, Nucl. Phys. B 300, (1998), 360-376. (K. Iohara) (Y. Koga)
机械名词英文词汇
工程图学词汇投影projection投影中心center of projection投影面projecting plane投影线projecting line中心投影法perspective projection平行投影法parallel projection斜投影oblique projection正投影orthographic projection正投影面frontal plane of projection侧面投影面profile plane of projection 投影图projection drawing三面投影图three-plane projection drawing投影轴axis of projection投影特性characteristic of projection不变性characteristic of true积聚性characteristic of concentration类似性characteristic of similarity视图view三视图three-view drawing正面frontal plane正面投影frontal projection水平面horizontal plane水平投影horizontal projection侧面profile plane侧面投影profile projection主视图frontal view俯视图top view左视图left side view立体solid平面立体plane body曲面立体body of curved surface回转面surface of revolution棱柱prism棱锥pyramid边side顶点center vertex棱edge点point直线line straight line棱锥台truncated pyramidfrustum of pyramid 重影coincidence of projection积聚concentrate变形deformation实长true length实形true shape正平线frontal line水平线horizontal line侧平线profile line一般位置直线oblique line铅垂线vertical line, frontal-profile line 正垂线horizontal--profile line侧垂线frontal-horizontal line一般位置平面oblique plane相交intersection平行parallel垂直perpendicular交线intersecting line, line of intersection交点point of intersection平行线parallel line垂直线perpendicular line交叉线skew line长度length宽度width高度height组合体complex基本几何体basic body相接built-up相交inter section相切tangent相贯penetration支架brace底板bottom board肋rib支承板bearing plate轮廓线outline, contour line底图traced drawing截平面cutting plane截交线line of section二重性dual nature平面曲线plane curve圆弧arc椭圆ellipse长轴major axis短轴minor axis双曲线hyperbola抛物线parabola圆circle圆锥顶conic apex相贯体intersecting bodies相贯线line of intersection空间曲线space curve截平面方法cutting plane method辅助面auxiliary surface辅助平面auxiliary plane最高点culminating point尺寸Size定形尺寸size dimension定位尺寸location dimension左视图right view后视图rear view, back view仰视图bottom view辅助图auxiliary view局部视图partial view, broken view斜视图oblique view旋转视图revolved view, aligned view 剖视图sectional view, section全剖视full section半剖视half section局部剖视图partial section, broken-out section斜剖视图oblique section旋转剖视图aligned section阶梯剖视echelon section, offset section 复合剖视compound section剖面图section, sectional view重合剖面coincide section, revolved section移出剖面removed section剖面线section line剖面符号symbols for section-lining习惯画法conventional drawing局部放大图drawing of partial enlargement零件图detail drawing, working drawing 第三角投影third angle projection粗实线continuous thick line, full line, visible line 细实线continuous thin line虚线dot line, dashed line, hidden line 点划线dash and dot line双点划线double dots line波浪线break line断裂线剖切平面迹线cutting plane line尺寸线dimension line尺寸界线extension tine尺寸dimension size箭头arrowhead基准datum基准线datum line基准面datum plane中心孔central hole中心距center distance轴shaft, axle孔hole斜孔inclination装配图assembly drawing性能尺寸characteristic dimension大小尺寸size dimension总体尺寸outer dimension外形尺寸配合尺寸fit dimension内圆角fillet外圆角round尖角sharp corner倒角chamfer轮缘flange of wheel缘、边、环rim轴肩shoulder凸台boss凹坑concave pit轴颈shaft neck轮毂hub轮辐spoke, spoke of wheel直纹滚花straight knurling s网纹滚花hatching knurling键槽key-way退刀槽escape拔模斜度pattern draft填料盒gland box油槽oil groove油封oil seal标准件standard parts螺纹thread外螺纹external thread内螺纹internal thread大径major diameter小径minor diameter螺距pitch of thread牙型form of thread旋向direction of turning右旋螺纹right-hand thread左旋螺纹left-hand thread头数number of thread导程lead粗牙coarse thread细牙fin thread螺栓bolt螺钉screw螺柱stud螺母nut垫片washer公差tolerance公差带tolerance zone零线zero line标准公差standard tolerance公差等级tolerance grade基本偏差fundamental deviation配合fit间隙配合clearance fit过盈interference过盈配合interference fit过渡配合transition fit基孔制hole-basic system of fits基轴制shaft-basic system of fits间隙clearance形状公差tolerance in form, form tolerance直线度straightness平面度flatness圆度roundness圆柱度cylindricity线轮廓度profile of any line面轮廓度profile of any plane位置公差tolerance in position, position tolerances平行度parallelism齿轮gear圆柱齿轮cylindrical gear正齿轮spur gear斜齿轮spiral gear轮齿gear tooth节圆pitch circle齿顶圆addendum circle, outside circle 齿根圆root circle, addendum circle模数modulus齿数number of teeth齿高tooth height齿顶高height of addendum齿根高height of addendum齿厚circular thickness齿间tooth space齿宽tooth width压力角angle of pressure弹簧spring销pin圆柱销round pin圆锥销taper pin开口销cotter pin, split键key平键flat key半圆键half round key, woodruff key 轴承bearing滚动轴承rolling bearing向心铀承radial bearing密封装置sealing equipment锁紧装置locking equipment粗糙度roughness基本尺寸basic size实际尺寸actual size极限尺寸limits size最大极限尺寸maximum limit of size 最小极限尺寸minimum limit of size 偏差deviation上偏差upper deviation下偏差lower deviation垂直度perpendicularity倾斜度angularity同轴度concentricity对称度symmetry位置度true position跳动run-out圆跳动cycle run-out全跳动total run-out轴测投影axonometric projection轴测投影面plane of axonometric projection轴测图axonometric drawing正等轴测投影isometric projection正二测bimetric projection斜二测oblique bimetric projection轴测轴axonometric axis轴间角axis angle, angle between ales缩短foreshortened轴向缩短率coefficient of axial deformation ratio offore shortening for any axis切割法cutting method, by cutting方箱法boxing method坐标法coordinate method方框法enclosing-square method四心近似法four-center approximate method机械工具词汇Mechanic's Tools 机械工具spanner 扳子(美作:wrench)double-ended spanner 双头扳子adjustable spanner, monkey wrench 活扳子,活络扳手box spanner 管钳子(美作:socket wrench)calipers 卡规pincers, tongs 夹钳shears 剪子wire cutters 剪线钳multipurpose pliers, universal pliers 万能手钳adjustable pliers 可调手钳punch 冲子drill 钻chuck 卡盘scraper 三角刮刀reamer 扩孔钻calliper gauge 孔径规hacksaw 钢锯rivet 铆钉nut 螺母locknut 自锁螺母,防松螺母bolt 螺栓pin, peg, dowel 销钉washer 垫圈staple U形钉grease gun 注油枪oil can 油壶jack 工作服机械加工词汇拋光polishing安装to assemble扳手wrench半机械化semi-mechanization; semi-mechanized半自动滚刀磨床semi-automatic hob grinder半自动化semi-automation; semi-automatic备件spare parts边刨床side planer变速箱transmission gear柄轴arbor部件units; assembly parts插床slotting machine拆卸to disassemble超高速内圆磨床ultra-high-speed internal grinder车床lathe; turning lathe车刀lathe tool车轮车床car wheel lathe车削turning车轴axle衬套bushing中间齿轮intermediate gear(counter gear)副轴齿轮counter shaft gear副轴counter shaft 变速器输入轴transmission imput shaft 速器输出轴transmission outpu中间齿轮intermediate gear(counter gear)副轴齿轮counter shaft gear副轴counter shaft变速器输入轴transmission imput shaft变速器输出轴transmission output shaft变速器主动齿轮轴transmission drive gear shaft变速器主轴transmission main shaft变速器中间轴transmission countershaft变速器轴的刚度rigidity of shaft变速齿轮比（变速比）transmission gear ratio传动比gear ratio主压力line pressure调制压力modulated pressure真空调制压力vacuum modulator pressure速控压力governor pressure缓冲压力compensator or trimmer pressure限档压力hold presure前油泵front pump (input pump )液力传动装置充油压力hydrodynamic unit change pressure后油泵gear pump (output pump )回油泵scavenge oil pump调压阀pressure -regulator vavle电磁阀调压阀solenoid regulator valve液力变矩器旁通阀converter bypass valve速控阀governor valve选档阀selectro valve换档阀shift valve信号阀signal valve继动阀relay valve换档指令发生器shift pattern generator档位指示器shift indicator(shift torwer)先导阀priority valve流量阀flow valve重迭阀overlap valve液力减速器控制阀retarder control valve液力起步fluid start零速起动stall start液力变矩器锁止converter lockup全液压自动换档系统hydraulic automatic control system 电液式自动换档系统electronic -hydraulic automatiec换档shift升档upshift降档downshift 动力换档power shfit单向离合器换档freewheel shfit人工换档manual shfit自动换档automaitc shfit抑制换档inhibited shift超限换档overrun shift强制换档forced shift换档点shift point叶片转位blade angle shift换档滞后shift hysteresis换档循环shift schedule换档规律process of power shift动力换档过程timing换档定时property of automatic shift 换档品质property of automatic shft换档元件engaging element换档机构gearshift操纵杆control lever变速杆stick shift(gear shift lever) （副变速器）变速杆range selector变速叉shifting fork (gear shift fork) 分动箱控制杆transfer gear shift fork变速踏板gear shift pedal变速轨（拨叉道轨）shift rail直接变速direct change(direct control)方向盘式变速column shift (handle change)按钮控制finger-tip control槽导变速gate change空档位置neutral position直接驱动direct drive高速档top gear(high gear)低速档bottom gear(low speed gear)第一档first gear第二档second gear超速档overdirve gear经济档economic gear倒档reverse gear爬行档creeper gear驱动特性drive performance反拖特性coast performance定输入扭矩特性constant input torque performance全油门特性full throttle performance寄生损失特性no load (parasitic losses)performance 原始特性primary characteristic 响应特性response characteristic吸收特性absorption characteristic全特性total external characteristic输入特性characteristic of enhance输出特性characteristic of exit力矩特性torque factor(coefficient of moment) 过载系数overloading ratio变矩系数torque ratio能容系数capacity factorr几何相似geometry similarity运动相似kinematic similarity动力相似dynamic similarity透穿性transparency万向节和传动轴universal joint and drive shaft万向节universal joint非等速万向节nonconstant velocity universal joint 等速万向节constant velocity universal joint准等速万向节near constant velocity universal joint 自承式万向节self-supporting universal joint非自承式万各节non self suporting universal joint回转直径swing diameter等速平面constant velocity plane万向节夹角true joint angle十字轴式万向节cardan (hookes)universal joint 万向节叉yoke突缘叉flange york滑动叉slip yoke滑动节，伸缩节slip joint花键轴叉slip shaft yoke轴管叉（焊接叉）tube(weld yoke)十字轴cross(spider)十字轴总成cross assembly挠性元件总成flexible universal joint球销式万向节flexible member assembly双柱槽壳housing球环ball球头轴ball head球头钉button中心球和座centering ball and seat球笼式万向节rzeppa universal joint钟形壳outer race星型套inner race保持架cage可轴向移动的球笼式万向节plunging constant velocity joint 筒形壳cylinder outer race柱形滚道星形套inner race withcylinder ball grooves 偏心保持架non-concentric cage滚动花键球笼式万向节ball spline rzeppa universal joint外壳outer housing内壳体inner housing球叉式万向节weiss universal joint球叉ball yoke定心钢球centering ball三球销万向节tripod universal joint三柱槽壳housing三销架spider双联万向节double cardan universal joint凸块式万向节tracta universal joint凸块叉fork yoke榫槽凸块tongue and groove couplijng凹槽凸块groove coupling传动轴drive shaft(propeller shaft)传动轴系drive line传动轴形式drive shaft type两万向节滑动的传动轴two -joint inboard slip ddiveshaft 两万向节外侧滑动传动轴two joint ouboard slip drive shaft单万向节传动轴single joint coupling shaft组合式传动轴unitized drive shaft传动轴减振器drive shaft absorber传动轴中间轴承drive shaft center bearing传动轴管焊接合件weld drive shaft tube assembly传动轴特征长度drive shaft length传动轴谐振噪声resonant noise of rive shaft传动轴的临界转速critical speed of drive shaft传动轴总成的平衡balance of drive shaft assembly允许滑动量slip相位角phase angle传动轴安全圈drive shaft safety strap驱动桥drive axle(driving axle)类型type断开式驱动桥divided axle非独立悬架式驱动桥rigid dirve axle独立悬架式驱动桥independent suspension drive axle 转向驱动桥steering drive axle贯通式驱动桥tandem axles“三速”贯通轴"three-speed" tandem axles单驱动桥single drive axle多桥驱动multiaxle drive 减速器reducer主减速器final drive单级主减速器single reduction final drive双级主减速器double reduction final drive前置式双级主减速器front mounted double reduction final drive后置式双级主减速器rear mounted double reduction final drive上置式双级主减速器top mounted double reducton final drive 行星齿轮式双级主减速器planetary double reduction final drive贯通式主减速器thru-drive双速主减速器two speed final drive行星齿轮式双速主减速器two speed planetary final drive双级双速主减速器two speed double reduction final drive 轮边减速器wheel reductor(hub reductro)行星圆柱齿轮式轮边减速器planetary wheel reductor行星锥齿轮式轮边减速器differential geared wheel reductor(bevelepicyclick hub reductor) 外啮合圆柱齿轮式轮边减速器spur geared wheel reductor差速器differential锥齿轮式差速器bevel gear differential圆柱齿轮式差速器spur gear differential防滑式差速器limited -slip differential磨擦片式自锁差速器multi-disc self -locking differential凸轮滑滑块自锁差速器self-locking differential with side ring and radial cam plate自动离合式自锁差速器automotive positive locking differential 强制锁止式差速器locking differential液压差速器hydraulic differential轴间差速器interaxial differential差速器壳differential carrieer(case)主降速齿轮final reduction gear驱动轴减速比axle ratio总减速比total reduction ratio主降速齿轮减速比final reduction gear ratio双减速齿轮double reduction gear差速器主齿轮轴differential pinion-shaft差速器侧齿轮differential side gear行星齿轮spider gear(planetary pinion)螺旋锥齿轮spiral bevel gear双曲面齿轮hypoid gear格里林齿制gleason tooth奥林康型齿制oerlikon tooth锥齿轮齿数number of teeth in bevel gears and hypoid gears锥齿轮齿宽face width of tooth in bevel gears and hypoid gears 平面锥齿轮plane bevel gear奥克托齿形octoid form平顶锥齿轮contrate gear齿面接触区circular tooth contact齿侧间隙backlash in circular tooth差速器十字轴differential spider差速器锁止机构differential locking -device差速器锁止系数differential locking factor差速器壳轴承carrier bearing桥壳axle housing整体式桥壳banjo housing可分式桥壳trumpet-type axle housing组合式桥壳unitized carrier-type axle housing 对分式桥壳split housing冲压焊接桥壳press-welding axle housing钢管扩张桥壳expanded tube axle housing锻压焊接桥壳forge welding axle housing整体铸造式桥壳cast rigid axle housing半轴axle shaft全浮式半轴full-floating axle shaft半浮式半轴semi-floating axle shaft四分之三浮式半轴three-quarter floating axle shaft驱动桥最大附着扭矩slip torque驱动桥额定桥荷能力rating axle capactiy驱动桥减速比driveaxle ratio驱动桥质量drive axle mass单铰接式摆动轴single-joint swing axle双铰接式摆动轴double joint swig axle悬架系suspension system悬架suspension类型type非独立悬架rigid axle suspension独立悬架independent suspension平衡悬架equalizing type of suspension 组合式悬架combination suspension可变刚度悬架variable rate suspension纵置板簧式parallel leaf spring type上置板簧式over slung type下置板簧式under slung type双横臂式double with-bone arm type 横置板簧式transversal leaf spring type 双纵臂式double trailing arm type单横臂式single transverse arm type双横臂式double -wishbone type 单横臂式singe trailing arm type双纵臂式double-trailing arm type单斜臂式single oblique arm tyep四连杆式four link type扭矩套管式torque tube drive type第迪安式De Dion type烛式sliding pillar type麦弗逊式MacPherson type金属弹簧式metal spring type空气弹簧式air spring type油气弹簧式hydro-pneumatic spring type 橡胶液体弹簧式hydro-rubber spring type橡胶弹簧式rubber spring type液体弹簧式hydraulic spring type三点悬架three-point suspension四点悬架four-point suspension部件assembly and parts悬架臂suspension arm上悬架臂upper suspension arm控制臂control arm上控制臂upper control arm下控制臂lower control arm纵臂trailing arm横臂transverse arm斜臂oblique arm支撑梁support beam横向推力杆lateral rod纵向推力杆longitudinal rod拉杆tension rod压杆strut bar支撑杆strut bar扭矩套管torque tube变截面弹簧tapered spring钢板弹簧leaf spring(laminated spring) 副钢板弹簧auxiliary spring非对称钢板弹簧unsymmetrical leaf spring单片式钢板弹簧single leaf spring多片式钢板弹簧muotileaved spring纵向钢板弹簧longitudinal leaf spring螺旋弹簧coil spring (helicalspring)空气弹簧air spring囊式空气弹簧bellow type air spring膜式空气弹簧diaphragm typeair spring橡胶弹簧rubber spring type 液体弹簧hydraulic spring油气弹簧hydro-pneumatic spring type单气室油气弹簧single chamber hydragas spring双气室油气弹簧double chamber hydragas spring液体弹簧hydraulic spring底盘弹簧chassis spring四分之一椭圆形弹簧quarter elliptic spring半椭圆形弹簧half-elliptic spring(semi-elliptic spring) 四分之三椭圆形弹簧three quarter elliptic spring全椭圆形弹簧full elliptic spring悬臂弹簧cantilever spring簧上质量sprung weight簧下质量unsprung weight垫上弹簧载荷量spring capacity at pad地面弹簧载荷量spring capacity at ground弹簧静挠度spring static deflection弹簧跳动间隙bump clearance of spring弹簧中心距distance between spring centers减振器shock absorber筒式减振器telescopic shock absorber油压缓冲器hydraulic buffer负荷调平式减振器load -levelling shock absorber液压减振器dydraulic shock absorber 可调减振器adjustable shock absorber 摇臂式减振器lever type shock absorber 磨擦式减振器frictional shock absorber充气减振器gas-filled shock absorber 动力减振器dynamic shock absorber减振器卸荷阀shock absorber relief valve 减振器进油阀shock absorber intake valve 减振器示功图damper indicator diagram 减振器液damper fluid横向稳定器stabilizer anti-roll bar滑动座sliding seat滑板sliding plate弹簧架spring bracket弹簧主片spring leaf钢板弹簧吊耳leaf spring shackle钢板弹簧衬套leaf spring bushing钢板弹簧销leaf spring pin弹簧卷耳spring eyeU型螺栓U bolt钢板弹簧中心螺栓leaf spring center bolt橡胶衬套rubber bushing 缓冲块buffer stopper限位块limiting stopper平衡轴trunnion shaft平衡轴支座trunnion base臂轴arm shaft平横臂equalizer螺纹衬套screw bushing（车身）高度阀levelling valve车架auxiliary tank整体车架unitized frame上弯式梁架upswept frame (kick up frame) 短型车架stub frame发动机支架engine mounting半径杆radius rod平衡杆stabilizer bar制动反应杆brake reaction rod分开式车身和车架separated body and frame车轮wheel车轮尺寸名称wheelsize designation车轮类型wheel type单式车轮single wheel双式车轮dual wheel整体轮毂式车轮wheel with integral hub组装轮辋式车轮demountable rim wheel对开式车轮divided wheel可调车轮adustable wheel辐板式车轮disc wheel可反装式车轮reversible wheel辐条式车轮wire wheel安装面attachment face安装面直径attachment face diameter 双轮中心距dual spacing半双轮中心距half dual spacing轮缘flange固定轮缘fixed flange轮缘规格代号flange size disignation轮缘高度flange height轮缘半径flange radius轮级端部半径flange edge radius轮级宽度flange width内轴承座肩inner bearing cup shoulder 内移距inset横向跳动lateral run-out外移距outset 径向跳动radius run-out轮辋rim轮辋尺寸名称rim size disignation轮辋宽度rim width标定轮辋宽度specified rim width轮辋直径rim diameter标定轮辋直径specified rim diameter轮辋类型rim types整体式（深槽式）one-piece(drop -center DC)半深槽式semi-drop center (SDC)二件式two-piece三件式three-piece四件式four-piece轮毂座hub seat五件式five-piece轮辋轮廓类型rim contour classification深槽轮辋drop center rim(DC)深槽宽轮辋wide drop center rim(WDC) 半深槽轮辋semi-drop center rim(SDC)平底轮辋flat base rim平底宽轮辋wide flat base rim (WFB)全斜底轮辋full tapered bead seat rim (TB)可拆卸轮辋demountable rim wheel 对开式轮辋divided rim(DT)轮辋基体rim base轮辋基体偏移距rim base offset轮辋偏移距rim bevel distance气门嘴孔valve hole气门嘴孔的位置rim hole location锁圈槽gutter锁圈槽沟gutter groove锁圈槽顶gutter tip隔圈spaceband隔圈宽度spacerband width标定轮辋直径specified rim diameter 标定轮辋宽度specified rim width花键spline弹性锁圈spring lock ring辐条式车轮轮毂shell (wire shell)轮辋槽well槽角well angle槽深well depth槽底半径well iner radius槽的位置well position 槽顶圆角半径well radius top槽宽度well width中心孔center hole中心线center line夹紧块clamp夹紧螺栓clamping bolt锥型座（螺帽定位用）cone seat (for retaining nut)可拆卸档圈detachable endless flange可拆卸弹簧档圈detachable spring flange可拆卸锥形座圈detachable endless taper bead seat ring 轮辐disc辐条wire spoke零移距zeroset弯距bending moment动态径向疲劳试验dynamic radial fatigue test横向疲劳试验cornering fatigue test轴安装axel mounting轴颈安装journal mounting孔径bore轮胎tyre (tire)轮胎系列tyre series轮胎规格tyre size轮胎标志tyre marking速度符号speed symbol胎面磨耗标志tread wear indicator骨架材料framework material层数number of plies层级ply rating外胎cover内胎inner tube胀大轮胎grown tyre充气轮胎pneumatic tyre新胎new tyre有内胎轮胎tubed tyre无内胎轮胎tubeless tyre水胎curing bag保留生产轮胎reserved old series of tyre 普通断面轮胎conventional section tyre 低断面轮胎low section tyre超低断面轮胎super low section tyre宽基轮胎wide base tyre斜交轮胎diagonal tyre子午线轮胎radial ply tyre活胎面轮胎removable tread tyre 越野轮胎cross-country tyre沙漠轮胎sand tyre浇注轮胎cast tyre调压轮胎adjustable inflation tyre海棉轮胎foam filled tyre常压轮胎atomospheric pressure tyre 内支撑轮胎internal supporter tyre拱形轮胎arch tyre椭圆形轮胎elliptical tyre实心轮胎solid tyre粘结式实心轮胎cured on solid tyre非粘结式实心轮胎pressed on solid tyre圆柱实心轮胎cylindrical base solid tyre 斜底实心轮胎conical base solid tyre抗静电实心轮胎anti-static solid tyre导电实心轮胎conductive solid tyre耐油实心轮胎oil-resistance solid tyre高负荷实心轮胎high load capacity solid tyre 胎面花纹treadpattern纵向花纹circumferetial pattern横向花纹transverse pattern公路花纹highway tread pattern越野花纹cross-country tread pattern 混合花纹dual purpose tread pattern 定向花纹directional tread pattern雪泥花纹mud and snow pattern花纹细缝pattern sipe花纹块pattern block花纹条pattern rib花纹沟groove花纹加强盘tie-bar of pattern花纹角度pattern angle花纹纹深度pattern depth花纹展开图patttern plan光胎面smooth tread胎冠crown胎面tread胎面行驶面tread cap胎面基部tread base胎面基部胶tread slab base胎面过渡胶transition rubber of tread 缓冲层breaker带束层belt缓冲胶片breaker strip 包边胶tie-in strip完带层cap ply胎体carcass帘面层cord ply隔离胶insulation rubber 封口胶sealing rubber胎里tyre cavity内衬层inside liner气密层innerliner胎肩shoulder胎肩区shoulder area胎肩垫胶shoulder wedge胎侧sidewall屈挠区flexing area胎侧胶sidewall rubber装饰胎侧decorative sidewall 装饰线decorative rib装配线fitting line防擦线kerbing rib胎圈bead钢丝圈bead ring钢丝包胶wire covering胎圈座bead seat胎圈座角度beat seat angle胎圈座圆角半径bead seat radius胎圈座宽度bead seat width可选择的胎圈座轮廓bead seat optional contours 凹陷型center-pente(CP)平峰型flat hump(FH)凸峰型round hump(RH)特殊座架special ledge(SL)胎圈芯bead core三角胶apex胎圈补强带bead reinforcing strip胎圈包布chafer胎圈外护胶bead filler rubber胎踵bead heel胎趾bead toe胎圈底部bead base内胎胎身tube body断面宽度section width断面高度section height高宽比（H/S）aspect ratio(H/S)外直径overall diameter 自由半径free radius转向系steering system类型type机械转向系manual steering system动力转向系power steering system转向操纵机构steering control mechanism直列式转向器in-line steering gear四边联杆式转向机构parallelogram linkage steering整体式动力转向机构integral type power steering总成和部件assemblies and parts转向万向节steering universal joint转向传动轴steering inner articulated shaft转向管柱steering column球轴承套管式转向管柱tube and ball type steering column 可伸缩式转向管柱telescopic steering column折叠式转向管柱collapsible steering column倾斜和缩进式转向管柱tilt and telescopic steering column 吸能式转向管柱energy-absorbing steering column 网络状转向柱管net type steering column转向轴steering shaft转向横轴cross shaft转向盘steering wheel倾斜式方向盘tilt steering wheel机构转向器manual steering gear蜗杆滚轮式转向器worm and roller steering gear转向器盖cover of steering gear壳体housing转向蜗杆steering worm滚轮roller滚轮轴roller shaft侧盖side cover摇臂轴pitman arm shaft循环球式转向器recirculating ball steering gear循环球和螺母式转向器recirculating ball and nut steering gear 循环球齿条齿扇式转向器recirculating ball-rack and sector steering gear转向螺母steering nut钢球ball转向螺杆steering screw循环球-曲柄销式转向器recirculating ball-lever and peg steering gear指销stud蜗杆指销式转向器worm and peg steering gear转向齿轮steering pinion转向齿条steering rack 动力转向器power steering stgear整体式动力转向器integral power steering gear常压式液压动力转向器constant pressure hydraulic power steering gear常流式液压动力转向器constant flow hydraulic power steering gear螺杆螺线式转向器screw and nut steering gear蜗杆指销式转向器worm and peg steering gear齿轮齿条式转向器rack and pinion steering gear变传动比转向器steering gear with variable ratio转向控制阀steering control valve滑阀式转向控制器spool valve type阀体valve housing滑阀valve spool转阀式转向控制阀rotary valve type扭杆torsion bar转向动力缸power cylinder转向油泵power steerig pump转向油罐oil reservoir转向传动杆系steering linkage动力转向系布置power steering system layout反作用阀reactive valve梯形转向机构ackerman steering整体式转向梯形杆系ackerman steering linkdage分段式转向梯形杆系divided ackerman steering linkage中间转向杆intermediate steering rod转向摇臂pitman arm转向直拉杆steering drag link中间转向联杆center steering linkdage端部螺塞end plug球头销ball stud球头座ball cup压缩弹簧compression spring梯形机构tie rod linkage梯形臂tie rod arm转向横拉杆steering tie rod接头socket横拉杆端接头tie rod end分段式梯形机构split tie rod type tie rod linkage摆臂swing arm动力转向power steering气压式动力转向air-power steering液压式动力转向hydraulic power steerig液压常流式动力转向hydraulic constant flow type power steering液压储能式动力转向hydraulic accumulator power steering 慢速转向slow steeirng快速转向fast steering (quick steering)过度转向oversteering转向不足understeering转向系刚度steering system stiffness转向盘自由行程free play of steering wheel转向器转动力矩rotating torque of steering gear转向力矩steering mometn转向阻力矩steering resisting torque转向力steering force转向传动比steering gear ratio (steering ratio0恒定转向传动比constant ratio steering可变转向传动比variable ratio steering转向系角传动比steering system angle ratio转向器角传动比steering gear angle ratio转向传动机构角传动比steering linkage angle ratio转向器传动效率steerign gear efficiency正效率forward efficiency逆效率reverse efficiency转向器扭转刚度torsional stiffness of steering gear转向盘总圈数total number of steering wheel turns 转向器总圈数total turns of steering gaer转向器传动间隙steering gar cleanrance摇臂轴最大转角max.rotating angle of pitman arm shaft 转向摇臂最大摆角max. Swing angle of steering pitman arm转向器反驱动力矩reverse rotating torque of steering gear 转向器最大输出扭矩steering gear max. Output torque最大工作压力max. Working pressure额定工作压力rated working pressure转向油泵理论排量theoretical displacement of pump限制流量limited flow转向控制阀预开隙pre-opened play of steering contol valve 转向控制阀全开隙totally -opened play of steering control valve转向控制阀内泄漏量internal leakage in steering control valve 转向控制阀压力降pressure loss in steering control valve转向器角传动比特性steering gear angle ratio characteristic转向器传动间隙特性steering gear clearance characterstic转向器传动效率特性steering gear efficeieny characteristic转向力特性steering force characteristic动力转向系灵敏度特性power steering systme response characteristic转向控制阀压力降特性steeirn gcontrol valve presrue loss characteristtic前桥front axle工字梁I-beam双工字梁twin I-beam非驱动桥dead axle转向节steering knuckle挂车转向装置steering system of trailer中央主销式转向装置central king pin type steering systme 无主销转向装置no king pin type steering system全杆式转向装置all linkage tyep steering system球销式转向节ball and socket steering knuckle转向节止推轴承steering knuckle thrust bearing前轮轴front wheel spindle转向盘轴steering spindle转向节轴knuckle spindle转向节臂steering knuckle arm（转向节）主销knuckle pin(King pin)反拳式前桥reverse elliott axle反拳式转向节reverse elliott steering knuckle叉式前桥elliott type axle叉式转向节elliott steering knuckle制动系braking ssytem类型tyep行车制动系统。
职称考试英语阅读理解
一、Sleep is something we generally associate with living persons or animals. Of course,it is true that a lot of animals sleep, but zoologists are not certain that primitive forms of animal life, like worms ever really sleep. On the other hand, animals such as bears sleep for 4 or 5 months every year.The amount of sleep human beings need varies with people of different ages, habits and possibly races. For example, doctors think that pre-school children need between 10 and 12 hours a night; school children between 9 and 11 hours; and adults between 7and9 hours. There are rare healthy. The sleep requirements of different races also appearto be different. Japanese people, for example, sleep fewer hours than Europeans.It is not known for certain if the activi ty of a man’s mind (besides dreaming) occurs when he is asleep. However, it is certainly true that some people can wake up at a pre-determined time. There are also stories about some math’s professors who solve difficult problems during sleep, because their subconscious minds continue working on the problem.译文：我们一般把睡眠与活着的人和动物联系在一起。
复述翻译专用
元素它们都有共有的特质，早期的周期表有空缺，丢失的元素。
多一个质子，就成了另一种元素。
但是有相应的原子数，却不知道相应的元素是什么。
预测正是指那个原子数确定但还仍未被发现的元素。
它在表中的位置可以告诉我们它的特性。
对那个时候的科学家来说找到这些缺失的元素并确认它们预定的特质是件很令人激动的事。
在早期的周期表中，43号元素没有符号因为那是有43个质子数的元素尚未被发现。
所以周期表上在42和44号元素中有空缺。
之后在1925年，由一位名叫Ida Tack的科学家带领的化学家团队声称他们找到了43号元素。
他们正在使用一项相对较新的技术X射线光谱学检查一种矿石样本。
他们称找到了有43个质子的元素，命名为Masuria.但是，当时几乎没有人相信Tack发现了新元素。
因为那时X射线光谱学是新方法，他们无法分离出足够多的Masurium作为使人信服的样本。
所以他们没有被人们相信。
但是后来，12年后，1937年，另一支队伍首次使用回旋加速器合成了一种元素。
这种元素有43个质子，但是他们将它命名为Technetium 以强调它是由技术人工合成的。
人们认为人工合成这一元素是唯一得到它的方法。
我们至今无法在自然界中找到它。
43号元素，无论称为Masurium还是Technetium，是具有放射性的放射性元素会衰变。
它会转变成其他元素。
正是由于43号元素放射性的衰变，它不能长久存在。
因此，如果它曾经在地球上存在过，也早就衰变了。
现在我们知道43号元素在自然中确实存在。
它可以从铀原子自发的裂变中自然产生。
很讽刺，发现Masurium的化学家Ida Tack,她是第一个提出铀可以分解成小片，但她不知道这成了她发现43号元素的证据。
作为Masurium，它是首次从自然裂变中发生的自然元素，作为Technetium，它首次在实验室发现。
当然，它是一种在被任何人发现或是制造之前，周期表让我们相信它存在的元素。
Elements they have common characteristics, early in the periodic table have vacancies, missing elements.More than a proton, became another element.But there are corresponding atomic number, but I do not know what is the corresponding elements.Prediction is refers to the atomic number sure but still undiscovered elements.Its position in the table can tell us its features.For scientists at that time to find the missing elements and confirm their reservation is a very exciting thing.In the early days of the periodic table, element number 43 no symbol because it is a element with 43 protons has not yet been found.So on the periodic table have any openings in the element number 42 and 44.Then, in 1925, by a man named Ida Tack team of scientists led by chemist claimed they found the element number 43.They are using a relatively new technology X-ray spectroscopy a ore samples.They found there are 43 protons called elements, named Masuria. However, at that time, almost no one believed Tack discovered a new element.Because X-ray spectroscopy is a new method and then they are not able to isolate enough Masurium as convincing samples.So they were not believed.But then, 12 years later, in 1937, the other team USES cyclotron synthesized a kind of element for the first time.This element with 43 protons, but they named it Technetium to emphasize it is made of synthetic technology.Synthetic this element is believed to be the only way to get it.We still can't find it in the nature.Element number 43, both called Masurium and Technetium is radioactive decay of radioactive elements will be.It will turn into other elements.It is because of number 43 element of the radioactive decay, it can't exist for a long time.So, if it once existed on the earth, also early decay.Now we knowthat number 43 element exists in the nature.It can be produced naturally from the spontaneous fission of uranium atoms.Ironically, found Masurium chemist Ida Tack, she was the first to put forward the uranium can be broken down into small pieces, but she didn't know it was she found evidence of element number 43.As a Masurium, it is the first time from the natural elements arising in the course of natural fission, as Technetium, it first discovered in the laboratory.And, of course, it is a find or create before by anyone, the periodic table make us believe that the elements of it exists.。
希腊罗马神话复习
希腊罗马神话复习一．单选（课文）10分二．判断（课文）10分三．表格（默写）20分四．名词解释（课后）20分C11.delphic: It relates to Delphi.It means ambiguous.2.Olypian: It relates to Olympian Gods.It means that some one is like a god,especially by being calm and not concerned about ordinary things.3.martial: It relates to Mars.It means something connected with war and fighting.4.nemesis: It relates to Nemesis.It means a punishment that is deserved and cannot be avoided.5.titanic:I t relates to Titans.It means something big ,strong and powerful.C21.Junoesque:It relates to Juno.It means someone is elegant and beautiful like Juno.2.Argus-eyed:It relates to Argus.It means someone is watchful and alert.3.satyr/satyriasis:It relates to Satyr.It means someone that has an abnormally intense sexual desire in men.4.mercurial:It relates to Mercury.It means having feelings that change suddenly and without warning.C41.chaotic:It relates to Chaos.It means messy and disorder.2.Pandora’s box:It relates to Pandora. It means the root of troubles.3.Promethean:It relates to Prometheus.It means a person who resembles Prometheus.C61.Dionysiac:It relates to Dionysus.It means Sensuality, debauchery, and revelry.C71.Midas’/ass’s ears:It relates to Midas.It means A secret that cannot be hid.It also menas someone is shallow and uninformed.2.Midas/the golden touch:It relates to Midas.It means touching a stone and turning it into gold.3.cut the Gordian knot:It relates to Alexander.It means solving a complex problem with a bold strike.C81.cereal:It relates to Ceres.It means grains.2.aureole:It relates to Aurora.It means a bright circle of light.C91.Charon’s boat/ferry:It relates to Charon.It means some one is going to die.2.cross the Styx:It means some one is going to die.C121.gain/reap/win（one’s）laurels: It relates to Daphne. It means gaining one’s honors.2.Look to one’s laurels:It relates to Daphne.It means to work hard in order not to lose the achievement.3.rest/repose/retire/sit(back)on one’s laurels: It relates to Daphne.It means to satisfy with what you have achieved and stop trying.4.a Noble/poet laureate:It relates to Daphne.It means to be a noble price winner.C131.cupidity: It relates to Cupid.It means a very strong desire for something.2.erotic:It relates to Eros.It means sexual excitement.C141.Aphrodite’s girdle:It relates to Aphrodite.It means unlimited female sexuality.2.adonis:It relates to Adonis.It means some one is a handsome young man.C161.Narcissism:It relates to Narcissus.It means the habit of always thinking about yourself and admiring yourself.C171.Pygmalion effect:It relates to Pygmalion. It is a phenomenon in which the greater the expectation placed upon people ,the better they perform.C181.atlantean:It relates to Atalanta. It means strong ,powerful and gigantic.2.Mount one’s Pegasus: It relates to Pegasus.It means to write a poem.3.a chimera in one’s brain: It relates to Perseus.It means the fantasy in one’s mind.C201.the choice of Heracles: It relates to Heracles.It means some one is in a dilemma.2.Cleanse the Augean Stable:It relates to Augeas.It means to remove something totally.3.Herculean effort:It relates to Hercules.It means great effort.C211.sow dragon’s teeth: It means to provoke war by spreading dispute;or cultivate warriors or monster.2.a Cadmean/Pyrrhic victory:It relates to Cadmus.It means a victory that comes at a great cost.C221.sphinx riddle:It relates to Sphinx.It means a puzzle which is very difficult to solve.C241.the apple of discord: It means the root of the trouble and any subject of possible of contention or disagreement.2.Achilles’heel:It relates to Achilles.It means a weak point in something that is otherwise perfect.3.hector: It relates to Hector.It means to intimidate or dominate in a blustering way.4.Achilles and Patroclus:It relates to Achilles and Patroclus.It means male friendship, a heroic friendship.5.Fight like a Trojan:It means to fight with great determination.6.Sulky like Achilles in his tent: It relates to Achilles.It means sulky.7.a Trojan horse:It means the hidden danger.8.Myrmidon: It means a faithful follower who carries out orders without question.9.Helen of Trojan:It relates to Helen.It means the root of war; a beauty who ruins her country;a terrible disaster brought by somebody or something you like best.10.Greek gift:It means a gift with evil purpose of the enemy; a gift to murder.五．简答题20分1.What did the ancient Greeks know about their world?The Greeks believed the earth to be flat and circular,their own country occupying the middle of it,the central point being either Mount Olympus,The earth is divided into two equal parts by the Sea.Around the earth flowed the River Ocean.2.To which place were mortals favored by the gods taken when they died?The Aethiopians.3.How did Zeus divide the rule of the world with his brother?Zeus’s portion was the heavens,Poseidon’s the ocean and Hades’s the realms of the dead.4.How was Venus married off to Vulcan?Jupiter gave her to Vulcan, in gratitude for the service he had rendered in forging thunderbolts.5.How did the Fates mete out human destiny?The three goddesses were assigned distinct task:Clotho spun the “thread” of human fate,Lachesis dispensed it and Atropos cut it.C21.What was Zeus’ usual way of hiding his scandals?He raised a cloud to hide some of his doings that would not bear the light and He turned the girl into an animal.2.How did the musical instrument “panpipe” come into being?Pan fell in love with A nymph called Syrinx,who was a faithful worshipper of Artemis.He chased her to the bank of river .With the water nymph’s help,Syrinx was turned into reeds.Pan was so sad and he made an instrument with the reeds,which called Syrinx.And that is the panpipe.3.How can you account for Zeus’s promiscuity?The promiscuity of Zeus serves more than entertaining purposes.It is out of political purpose.Men have a powerful ability to reproduce in order to reproduce more offspring, . For most of the people in the world flows his blood, is one of the methods can have more faithful follows.And the number of the faithful follows decide whether his regime is firm.C41.What was the direct cause of Prometheus’ obtaining fire for man?When Epimetheus created man ,he had nothing left for him.2.What attitude toward women is shown through the story of Pandora?The story shows the ancient Greeks thought women were inferior and affiliated to men,and they were the root evil and trouble.3.Which age of man applies to our own age?Please elaborate.I think we are in the Iron Age.People work day and night and man’s character is more complex,though mixed with kindness, but more evil.Human wants to rule everything.People no longer trust each other.Married people do not love each other.Vows are regarded as dust.Kindness and justice are no longer seen as the norm of conduct, but merely violence.4.How is the first woman often described as a “lovely evil”?How does she compare with Eve in the Book of Genesis?Pandora is described as a “lovely evil” because she was the most beautiful and sweetest woman,but she opened box and made many evil things free.Both Pandora and Eve are beauties.They are also described as the root of troubles to take the blame for the male society.But they were created out of different purpose.Pandora was created as the cost of Prometheus stealing the fire for man.She symbolizes a great temptation and human misery.Eve is inferior and affiliated to the man and just like a slave and she was created to help man.5.Why did Zeus try to withhold fire from human beings?Because fire is a symbol for technology and civilization.A basic distinction in myth between raw & cooked and wild & civilized.As a revenge for Prometheus' earlier theft of the finest sacrificial portions.By withholding fire, Zeus makes the division of the sacrifice impracticable. The humiliation of Ze us prompted him to take the extreme measure of withholding fire from mankind, without which m an would soon be little more than animals.C61.What led to Bacchus’ wanderings?Bacchus invented how to plant grapes and brew wine. He was wandering aroundand spread this kind of knowledge to bring people the joy of drinking.C71.How did Midas acquire the power of turning everything to gold?Because Midas rescued Bacchus’s teacher, Slilenus, and treated him hospitably, entertaining him for ten days and nights with an unceasing round of jollity. In return, Bacchus gave him thepower of turning everything to gold.C81.What made Hades fall in love with Proserpine?As signs of womanly beauty began to shine along side her childlike innocence, the adolescent god dess Persephone unwittingly attracted the attention of the Greek god Hades.2.Why was Venus displeased with Athena,Diana,and Proserpine?Because she thought all of them looked down upon the power of her and her son.3.What prevented Proserpine’s freedom from the Underworld?Three pomegranate.4.From what aspects can the Demeter myth be interpreted?Change of seasonsC91.Where are the different ghosts conveyed in the underworld?The evil ghosts will be sent to Tartarus.The virtuous ghosts will be sent to Elysium.2.Describe the difference between Elysium and Tartarus and the situation of their respective inhabitants?Elysium ,ruled over by Cronus, lies near Hades’ dominions.It s a happy land of perpetualday,without cold or snow,where games,music,and revels never cease,and where the inhabitants may elect to be reborn on earth whenever they please.In Greek mythology ,Tartarus is a deep chasm surrounded by three heavy curtain and three bronze doors.In Roman mythology,it is a vast river of lava.It is a painful place in where the Furieslive.Inhabitants in it suffer a lot.C111.How were Atalanta and her husband changed into lions?They forgot to pay due honor to Venus and the goddess was provoked attheir ingratitude.She caused them to give offence to Cybele.Cybele tookfrom them their human form and turned them into animals of charactersresembling their own.C121.what was the cause of Apollo’s love for Daphne?Cupid’s golden arrow struck Apollo’s heart.2.What did Peneus mean by “ Your face will forbid it”?He meant Daphne’s wish would not come true because of her beautiful face.C131.What did the oracle of Apollo say about Psyche’s future husband?He said her future husband awaited he on the top of the mountain and he was a monster whom neither gods nor men could resist.2.What tempted Psyche to open the box she was bringing back to Venus?A longing desire to put the beauty on her cheeks to become more beautiful.3.What is the significance of the union of Cupid and Psyche?Love itself is really a happy and painful pursuit of the process,and the process of love must be ups and downs.C141.Why did Venus advise Adonis against attacking wild animals?Because the wild animals were dangerous and she didn’t want to lose her beloved Adonis.2.What did Venus do to commemorate her ill-fated lover?She changed his blood into short-loved flowers and its blossom open when the wind blows.C151.What aspect does this story show about love?The miserable and beautiful aspect of love.C161.What incurred Juno’s anger towards Echos?Her talk that contrived to detain Juno till Zeus and the nymphs madetheir escape.2.What was Juno’s punishment for her?No power to speak first.C181.What was the cause of Perseus’s adventures?Polydectes wanted an easy access to Danae and got rid of Perseus.So he sent Perseus to kill Medusa.2.How was Medusa killed?Perseus borrowed the shield from Minerva and winged shoes from Hermes,approached Medusa while she slept. He was guided by her image reflection in the bright shield and cut off her head.C191.How did the Argonauts pass through the Clashing Rocks?They went along the passage found by the dove they sent out and passed the Clashing Rocks safely.2.What made Medea kill her own children?The fury with jealousy and the thought to punish Jason further.C201.How did Heracles demonstrate his prowess in his infancy?He strangled two snakes which Zeus’ jealous wife Hera had sent to attack him.2.What incident motivated the Labors of Heracles?He was told by the Delphic Oracle to serve Eurystheus for 12 years and win immortality by performing the labors the king imposed upon him.3.What does the last labor of Heracles symbolize?C211.What was the cause of Cadmus’ adventures?Because his sister was carried away by Zeus,and his father commandedhim to go in search of his sister.C221.How did he kill his own s father?In order to avoid killing his father and married his mother of, he escaped from the Collins, on the way, he killed his father by accident.2.What do you know about the Sphinx riddle?Sphinx riddle is often used to describe the problems which are complex, mysterious and hard to understand.C241.Who presented the apple of discord and for what purpose?Eris was angry because she had been left out of the feast. She threw among the guest the apple of discord inscribed “for the fairest” to make an issue between Hera, Athena and Aphrodite.2.Why was Paris as a baby left in the wilderness to die?Because when her mother Hecuba was pregnant, she dreamed she was giving birth to a torch from which streamed hissing serpents and it would bring unfortunate and disasters to the kingdom.3.Why were the former suitors of Helen willing to help Menelaus in the war of reclaiming his wife from Troy?Because Helen’s father Tyndareus made all the suitors swear an oath to come to the aid of her husband if she should ever be abducted.4.What’s behind the reluctance of Odysseus and Achilles to join in the expedition?Their love to their families.5.What dose the argument between Agamemnon and Achilles show about their character?It showed Agamemnon was stubborn while Achilles was honest and strong-minded.6.What brought Achilles back to the battlefield?His reconciliation with Achilles and his pride and glory.7.Why was Achilles so barbaric in his treatment of Hector’s corpse?Because he was so angry with what Hector had done.pare the values in the story with those that people hold today.Tow what extent are dignity, honor,glory,fame,and revenge still important?六．问答题20分1.Make a comparison between Dionysus and Apollo from their attributes, mottoes and spirits.2.What do you think is love ?Explain your opinion with the mythologies.(期中论文）C203.What heroic qualities dos Heracles possess?How does he differ from the other heroes like Jason and Perseus?C224.Do you believe in fate? To what degree are we in control of our own life?。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Role of Broken Gauge Symmetry in Transport Phenomena Involving Neattices
Scott R. Chubb Remote Sensing Division Naval Research Laboratory, Washington, DC 20375, USA
particular particles (x-rays, neutrons, etc. ) scatter elastically off of the solid. An ordered, periodic, or periodically ordered solid refers to the limit in which the resolution between different diffraction peaks and the number of peaks asymptotically approach the resolution and number that one would conventionally associate with a diffraction pattern involving a situation in which a macroscopic number of scattering centers can be involved with the scattering processes that are responsible for the pattern. For the purpose of determining critical time- and length- scales associated with experiments involving finite size optical lattices, a number of the arguments involving finite size effects (and the associated overlap features) in partially ordered solids can also be generalized to optical lattices. (This topic is addressed in the final section of the paper.) The underlying logic behind the analysis follows from a number of general results that are required in order to insure that the reaction rate be minimized (through minimal overlap with potential perturbations) for a potential process that can couple the ground state (GS) to the lowest-lying excited states, in a solid or lattice. In particular, in general, the GS of a many-body system is required to have minimal overlap with external perturbations and with the lowest-lying excited states. But in the idealized limit in which a set of measurements can be performed, in such a way that the measurement process does not affect the energy of any of a number of potential many-body states (including the GS), locally, in a particular region of space, each measurement can be viewed as a form of “symmetry operation”. When each of these symmetry operations can be related to the others through one or more continuously-varying parameters (for example, through measurements of a continuously-varying angle or displacement, performed outside the particular region of space), the set of symmetry operations is referred to as a gauge symmetry. But because no symmetry operation is perfect, residual perturbations, tied to the measurement process exist. In the presence of these perturbations, the overlap of the GS with low-lying excited states is minimized through processes that minimize the GS energy. The resulting changes in wave function overlap and energy occur through a process that is referred to as broken gauge symmetry. Provided the particular region (which will be referred to as the bulk region) occurs within the solid (or within a lattice), where the numbers of neutral and charged particles are conserved (relative to a particular, well-defined boundary or boundary region), the rate of change of any process involving the GS and its overlap with low-lying excited states (through residual perturbations) is dominated by a universal broken gauge symmetry that occurs in ordered, finite lattices (the loss of translation symmetry at the boundaries of a lattice). In this particular limit: 1. In the absence of the residual perturbations, the energy remains invariant with respect to the gauge symmetry operation associated with performing a rigid shift of the bulk region, in which the coordinate of each particle in the bulk is shifted by the same, constant amount; 2. Since, by construction, the associated coordinate transformation (which is referred to as a Galilean, coordinate transformation) preserves the separation between each particle and the remaining particles in the bulk, a large degeneracy exists, and (in the presence of broken gauge symmetry) the lowest-lying excited states are all related to the GS through one of the possible (Galilean) transformations; and 3. In the presence of residual interactions, the lowest-lying excited states conserve particle number within the bulk region. Since the associated transformations do not alter the relative separations between any of the particles, effectively, the resulting change in position of the particles can be viewed as occurring through a form of “perfect” rigid body motion, in which the entire collection of particles moves with a common velocity, that is similar to the nearly-perfect, lattice recoil that