第二次课翻译解答
Practice 1
undeniable: 不可否认的；千真万确的
overwhelming：难以抵挡的，无法抗拒的
Occasionally, life can be undeniably, impossibly difficult.
We are faced with challenges and events that can seem overwhelming, life-destroying to the point where it may be hard to decide whether to keep going. But you always have a choice.
Jessica Heslop shares her powerful, inspiring journey from the worst times in her life to the new life she has created for herself.
有时候，生活困难得难以置信，但又不容置疑。
我们面临的挑战与困境似乎无法抵御，试图毁灭我们生活，甚至使你犹疑是否继续走下去。但是你总有选择的余地。
从人生低谷走向新生活的杰西卡·赫斯乐普，在这里与我们分享她启迪心灵、充满震撼力的生活之旅。
Practice 2
elixir：万灵药，灵丹妙药，长生不老药
indefinite：不确定的；不清楚的；无限期的
perennial: 长期存在的；常年的；不断发生的；反复的
fleeting: 短暂的，迅速的
bust: 萧条，衰退
boom: 繁荣，迅速发展
Economic growth is the religion of the modern world, the elixir that eases the pain of conflicts, the promise of indefinite progress.
It is the solution to our perennial worries about not getting what we don’t have. And yet, at least in the West, the growth model is now as fleeting as Proust’s Albertine Simonet: Coming and going, with busts following booms and booms following busts, while an ideal world of steady, inclusive, long-lasting growth fades away.
经济增长是当代世界的最高信条，缓解冲突之痛的灵丹妙药，是对无限进步的美好承诺。
我们总是担心无法得偿所愿，而它就是解决这种担心的答案。
不过，至少在西方，增长模式如今就像普鲁斯特笔下的阿尔贝蒂娜·西莫內那样捉摸不定：来了又去，萧条过后是繁荣，繁荣过后又是萧条，而那种稳定、包容而持久增长的理想世界却渐行渐远。
实用英文写作与翻译作业与参考答案21
实用英文写作与翻译2-1作业及参考答案 第一次作业： Americans Eat Out More often and Less Healthfully Although food cooked at home is far more healthful than meals eaten at restaurants, Americans are dining out more than ever, the U.S. Agriculture Department said Tuesday. Restaurant food accounted for（[在数量，比例方面] 占） 39 percent of U.S. meals bought in 1996, up from 26 percent in 1970, the department said in a report, ``Away-From-Home Foods Increasingly Important to Quality of American Diet.'' ``While（尽管）the nutritional quality（营养质量）of foods consumed by Americans has improved overall, foods prepared at home are generally much more healthful than away-from-home foods,'' the department said. ``Despite nutritional gains at home, Americans will find it difficult to improve their diets because they purchase so many meals outside the home,'' the study said. While （尽管）the nutritional content of food prepared both at home and in restaurants has improved in recent years, food eaten out contains more of the nutrients Americans typically（一般地；通常）eat too much of, including fat and saturated fat（饱和脂肪）, and less of what is lacking from most diets, such as calcium, fiber and iron. The department recommended nutrition education programs should place more emphasis on teaching U.S. consumers about how to order healthful meals when dining out. Improved diets have been found to prevent risk of heart disease, stroke（中风）, cancer, diabetes（糖尿病）, osteoporosis-related hip fractures（与骨质疏松症有关的髋关节骨折） and neural tube birth defects（神经管先天缺损）. Osteoporosis-related hip fractures cost up to $10.6 billion each year in the United States in medical care expenses, missed work and premature deaths（早亡）, the department said. 参考译文：美国人外出用餐频繁而饮食健康水准美况愈下 据美国农业部星期二称尽管在家煮烧的食物远比餐馆里所用之餐有益于健康，美国人外出用餐更频繁。餐馆里的食物占1996年美国人购餐的39%，比1970年增长了26%。该部门在报告中称：“外出所用之餐对于美国人饮食质量日益重要”。该部门还称：“虽然美国人消费的食物的营养质量总体改善了。但是，一般来说，家里所备的食物远比外出用餐的食物有益于健康。”研究表明：“尽管在家里用餐能获取养份，美国人发觉他们难以改善自己的饮食，因为他们多次在外购餐。”近年来在家里和餐馆里所备的食物的营养结构都得到了改善，然而，外出用餐的食物包含了较多典型的美国人汲取过多的养份，包括脂肪和饱和脂肪，也包含了较少多数饮食中所缺少的，如钙，纤维和铁。该农业部提议营养教育计划应更着重于教导美国消费者外出用餐时如何预定有益于健康的一餐。人们发现改善后的饮食结构能预防心脏病，中风，癌症，糖尿病，与骨盆炎相关的髋部骨折以及试管婴儿的神经缺陷所带来的危险。该部门称，在美国与骨盆炎相关的髋部骨折每年在医疗照料费用，医疗失误和早产死亡之上的耗费高达106亿美元。 第二次作业 1、Kill one’s appetite ?Kill time ?Kill the peace ?Kill the mood ?Kill the proposal ?Kill the engine ?Kill the child with kindness 2、If the doctor had been available, the child would not have died. 3、This ticket is available in all parks. 4、I’ll have Mr. Perkin call you back as soon as he is available.
专业英语翻译
Veterinary Immunology and Immunopathology 141 (2011) 133–138 Contents lists available at ScienceDirect Veterinary Immunology and Immunopathology j o u r n a l h o m e p a g e :w w w.e l s e v i e r.c o m /l o c a t e /v e t i m m Short communication Saccharomyces cerevisiae decreases in?ammatory responses induced by F4+enterotoxigenic Escherichia coli in porcine intestinal epithelial cells Galliano Zanello a ,b ,1,Franc ?ois Meurens a ,1,Mustapha Berri a ,Claire Chevaleyre a ,Sandrine Melo a ,Eric Auclair b ,Henri Salmon a ,? a Institut National de la Recherche Agronomique (INRA),UR1282,Infectiologie Animale et SantéPublique,F-37380Nouzilly (Tours),Indre et Loire,France b SociétéIndustrielle Lesaffre,Lesaffre Feed Additives,Marcq-en-Baroeul,France a r t i c l e i n f o Article history: Received 19October 2010Received in revised form 13December 2010 Accepted 31January 2011Keywords: Saccharomyces cerevisiae Enterotoxigenic Escherichia coli Pig Intestinal epithelial cells Cytokines Chemokines a b s t r a c t Probiotic yeasts may provide protection against intestinal in?ammation induced by enteric pathogens.In piglets,infection with F4+enterotoxigenic Escherichia coli (ETEC)leads to in?ammation,diarrhea and intestinal damage.In this study,we investigated whether the yeast strains Saccharomyces cerevisiae (Sc ,strain CNCM I-3856)and S.cerevisiae variety boulardii (Sb ,strain CNCM I-3799)decreased the expression of pro-in?ammatory cytokines and chemokines in intestinal epithelial IPI-2I cells cultured with F4+ETEC.Results showed that viable Sc inhibited the ETEC-induced TNF-?gene expression whereas Sb did not.In contrast,killed Sc failed to inhibit the expression of pro-in?ammatory genes.This inhibition was dependent on secreted soluble factors.Sc culture supernatant decreased the TNF-?,IL-1?,IL-6,IL-8,CXCL2and CCL20ETEC-induced mRNA.Furthermore,Sc culture supernatant ?ltrated fraction <10kDa displayed the same effects excepted for TNF-?.Thus,our results extended to Sc (strain CNCM I-3856)the inhibitory effects of some probiotic yeast strains onto in?ammation. ? 2011 Elsevier B.V. All rights reserved. 1.Introduction Enterotoxigenic Escherichia coli (ETEC)are pathogenic gram negative bacteria which infect humans and sev-eral species of farm animals such as calves and pigs.ETEC interacts with intestinal epithelial cells,colonizes the small intestine and secretes enterotoxins such as the heat-labile enterotoxins (LT),the heat-stable enterotox-ins (STa and/or STb),and the enteroaggregative E .coli heat-stable enterotoxin 1(EAST1)(Nagy and Fekete,2005).In pigs,ETEC infection and enterotoxin secretions can induce intestinal in?ammation and diarrhea resulting in reduced growth rate,increased mortality and economic ?Corresponding author.Tel.:+33247427331;fax:+33247427779.E-mail addresses:salmon@tours.inra.fr ,henri.salmon@tours.inra.fr (H.Salmon).1 These authors contributed equally to this work.loss (Fairbrother et al.,2005).Moreover,F4+ETEC strain induce pro-in?ammatory response in intestinal epithe-lial cells (Devriendt et al.,2010).Administration of the yeast Saccharomyces cerevisiae variety boulardii (Sb )has been shown to protect pigs in reducing ETEC transloca-tion (Lessard et al.,2009).In vitro studies showed that Sb secretes soluble factors that decrease the expression of pro-in?ammatory cytokines induced by enteric pathogens (Zanello et al.,2009).However,to our knowledge,there is no in vitro data regarding the anti-in?ammatory effects of S.cerevisiae (Sc )secreted soluble factors.Sc and Sb are members of the same species but they differ geneti-cally,metabolically and physiologically (Edwards-Ingram et al.,2007;Hennequin et al.,2001).Thus,in this study,we assessed if the non-commensal and non-pathogenic yeasts Sc (strain CNCM I-3856)and Sb (strain CNCM I-3799)secreted factors allowing the down-regulation of pro-in?ammatory gene expression in intestinal epithe-lial cells cultured with F4+ETEC.Sc (strain CNCM I-3856) 0165-2427/$–see front matter ? 2011 Elsevier B.V. All rights reserved.doi:10.1016/j.vetimm.2011.01.018
通信工程常用专业英语简写中英文翻译
通信工程常用专业英语简写中英文翻译 3GPP 3rd Generation Partnership Project 第三代合作伙伴计划 1x RTT cdma2000 1x Radio Transmission Technology cdma2000 第一代无线接入技术 ACK Acknowledge 确认 ACLR Adjacent Channel Leakage power Radio 邻信道泄露功率比 ACS Adjacent Channel Selectivity 邻信道选择性 AMC Adaptive Modulation and Codeing自适应编码调制 A-MPR Additional Maximum Power Reduction 额外最大功率回退 AoA Angle of Arrival 到达角 AoD Angle of Departure 离开角 ARQ Automatic Repeat request自动重传请求 AS Angel Spread 角度扩展 AWGN Additive White Gaussian Noise 加性高斯白噪声 B3G Beyond 3rd Generation 后三代 BCCH Broadcast Control Channel 广播控制信道 BCH Broadcast Channel 广播信道 BD Block Diagonalization块状对角化 BER Bit Error Rate 误比特率 BLER Block Error Rate误块率 BM-SC Broadcast-Multicast Service Centre 广播/多播业务中心 BSR Buffer Status Reports 缓存状态报告 CA Carrier Aggregation 载波聚合 CBRM Circular Buffer Rate Matching 循环缓存速率匹配 CC Component Carrier 成员载波 CC Chase Combine Chase聚合 CCCH Common Control Channel 公共控制信道 CCCH Common Control Channel 公共控制信道 CCE Control Channel Element 控制信道单元 CCO Coverage and Capacity Optimization 容量与覆盖优化 CCO Cell Change Order 小区改变命令 CCSA China Communication Standards Association 中国通信标准化协会 CDD Cyclic Delay Diversity 循环延迟分集 CDMA Code Division Multiple Access 码分多址接入 cdma2000 Code Division Multiple Access 2000码分多址2000接入系统 CFI Control format Indicator 控制格式指示 CGI Cell Global Identifier 全球小区标识 CoMP Coordinated Multi-Point transmission 协调多点传输 CP Cylic Prefix 循环前缀 CPM Conference Preparing Meeting 大会准备会议 CQI Channel Quality Indicator 信道质量指示 CRC Channel Redundancy Check 信道冗余校验 B-RNTI Cell-Radio Network Temporary Identifier 小区无线网络临时标识
《机械工程专业英语教程》课文翻译
Lesson 1 力学的基本概念 1、词汇： statics [st?tiks] 静力学；dynamics动力学；constraint约束；magnetic [m?ɡ＇netik]有磁性的；external [eks＇t?:nl] 外面的, 外部的；meshing啮合；follower从动件；magnitude [＇m?ɡnitju:d] 大小；intensity强度，应力；non-coincident [k?u＇insid?nt]不重合；parallel [＇p?r?lel]平行；intuitive 直观的；substance物质；proportional [pr?＇p?:??n?l]比例的；resist抵抗，对抗；celestial [si＇lestj?l]天空的；product乘积；particle质点；elastic [i＇l?stik]弹性；deformed变形的；strain拉力；uniform全都相同的；velocity[vi＇l?siti]速度；scalar[＇skeil?]标量；vector[＇vekt?]矢量；displacement代替；momentum [m?u＇ment?m]动量； 2、词组 make up of由……组成；if not要不，不然；even through即使，纵然； Lesson 2 力和力的作用效果 1、词汇： machine 机器；mechanism机构；movable活动的；given 规定的，给定的，已知的；perform执行；application 施用；produce引起，导致；stress压力；applied施加的；individual单独的；muscular [＇m?skjul?]]力臂；gravity[ɡr?vti]重力；stretch伸展，拉紧，延伸；tensile[tensail]拉力；tension张力，拉力；squeeze挤；compressive 有压力的，压缩的；torsional扭转的；torque转矩；twist扭，转动；molecule [m likju:l]分子的；slide滑动; 滑行；slip滑，溜；one another 互相；shear剪切；independently独立地，自立地；beam梁；compress压；revolve (使)旋转；exert [iɡ＇z?:t]用力，尽力，运用，发挥，施加；principle原则, 原理，准则，规范；spin使…旋转；screw螺丝钉；thread螺纹； 2、词组 a number of 许多；deal with 涉及，处理；result from由什么引起；prevent from阻止，防止；tends to 朝某个方向；in combination结合；fly apart飞散； 3、译文： 任何机器或机构的研究表明每一种机构都是由许多可动的零件组成。这些零件从规定的运动转变到期望的运动。另一方面，这些机器完成工作。当由施力引起的运动时，机器就开始工作了。所以，力和机器的研究涉及在一个物体上的力和力的作用效果。 力是推力或者拉力。力的作用效果要么是改变物体的形状或者运动，要么阻止其他的力发生改变。每一种
国际结算第二次作业
AGB Bank _________________________SWIFT Message Ack（可不翻译） ____________________________ Notification (Transmission) of Original sent to SWIFT (ACK) Network Delivery Status : Network Ack Sender :AGUBDZALXXX ALGERIA GULF BANK ALGERIA ALGIERS Receiver :PNBPCNSHXXX WACHOVIA BANK, NA CHINA SHANGHAI ---------------------------------------------------------------------- Message Body: _____________________________________________________________________ _ :27: Sequence of Total（不用翻译） 1/1 :40A: Form of Documentary Credit IRREVOCABLE :20: Sender's Reference 201CD10488542 :31C: Earliest Exercise Date 100811 :40E: Applicable Rules UCP LATEST VERSION :31D: Date and Place of Expiry 101104 WACHOVIA :51A: Sending Institution（不用翻译） AGUBDZAL :50: Ordering Customer（不用翻译） SARL DISMAC
各专业的英文翻译剖析
哲学Philosophy 马克思主义哲学Philosophy of Marxism 中国哲学Chinese Philosophy 外国哲学Foreign Philosophies 逻辑学Logic 伦理学Ethics 美学Aesthetics 宗教学Science of Religion 科学技术哲学Philosophy of Science and Technology 经济学Economics 理论经济学Theoretical Economics 政治经济学Political Economy 经济思想史History of Economic Thought 经济史History of Economic 西方经济学Western Economics 世界经济World Economics 人口、资源与环境经济学Population, Resources and Environmental Economics 应用经济学Applied Economics 国民经济学National Economics 区域经济学Regional Economics 财政学（含税收学）Public Finance (including Taxation) 金融学（含保险学）Finance (including Insurance) 产业经济学Industrial Economics 国际贸易学International Trade 劳动经济学Labor Economics 统计学Statistics 数量经济学Quantitative Economics 中文学科、专业名称英文学科、专业名称 国防经济学National Defense Economics 法学Law 法学Science of Law 法学理论Jurisprudence 法律史Legal History 宪法学与行政法学Constitutional Law and Administrative Law 刑法学Criminal Jurisprudence 民商法学(含劳动法学、社会保障法学) Civil Law and Commercial Law (including Science of Labour Law and Science of Social Security Law ) 诉讼法学Science of Procedure Laws
《自动化专业英语》中英文翻译-中文部分
第二部分 控制理论 第1章 1.1控制系统的引入 人类控制自然力量的设计促进人类历史的发展,我们已经广泛的能利用这种量进行在人类本身力量之外的物理进程?在充满活力的20世纪中,控制系统工程的发展已经使得很多梦想成为了现实?控制系统工程队我们取得的成就贡献巨大?回首过去,控制系统工程主要的贡献在机器人,航天驾驶系统包括成功的实现航天器的软着陆,航空飞机自动驾驶与自动控制,船舶与潜水艇控制系统,水翼船?气垫船?高速铁路自动控制系统,现代铁路控制系统? 以上这些类型的控制控制系统和日常生活联系紧密,控制系统是一系列相关的原件在系统运行的基础上相互关联的构成的,此外控制系统存在无人状态下的运行,如飞机自控驾驶,汽车的巡航控制系统?对于控制系统,特别是工业控制系统,我们通常面对的是一系列的器件,自动控制是一个复合型的学科?控制工程师的工作需要具有力学,电子学,机械电子,流体力学,结构学,无料的各方面的知识?计算机在控制策略的执行中具有广泛的应用,并且控制工程的需求带动了信息技术的与软件工程的发展? 通常控制系统的范畴包括开环控制系统与闭环控制系统,两种系统的区别在于是否在系统中加入了闭环反馈装置? 开环控制系统 开环控制系统控制硬件形式很简单,图2.1描述了一个单容液位控制系统, 图2.1单容液位控制系统 我们的控制目标是保持容器的液位h 在水流出流量V 1变化的情况下保持在一定 可接受的范围内,可以通过调节入口流量V 2实现?这个系统不是精确的系统,本系 统无法精确地检测输出流量V 2,输入流量V 1以及容器液位高度?图2.2描述了这 个系统存在的输入(期望的液位)与输出(实际液位)之间的简单关系, 图2.2液位控制系统框图 这种信号流之间的物理关系的描述称为框图?箭头用来描述输入进入系统,以及
新编实用英语综合教程(第二版)课后翻译习题解
Unit 1 5. 1.她一家商店一家商店的看，最后以她能付出的价格买了她所需要的东西。She shopped around till she got what she wanted at a price she could afford. 2.除了向我要东西，他从不跟我说话。 He never speaks to me other than to ask for something. 3.你永远应该以搞好你的工作为目的。 You should always aim at doing your job well. 4.几个星期来她一直呆在家中照顾有病的父亲。 She has been tied to the house for weeks looking after her invalid father. 5.修建这条路是为了缓解交通拥挤。 The route was designed to relieve traffic congestion. 6.社会是由形形色色的人组成的。有些人很好，有些人很坏，也有些人介乎两者之间。 Society is made up of a wide variety of people; some are good, others (are) bad, and still others (are) in between. Unit 2 5 1.这个星期你每天都迟到，对此你如何解释？ How do you account for the fact that you've been late every day this week? 2.政府已经承诺改善落后地区人民的生活条件。 The government has committed itself to improving the life conditions of the people living in the underdeveloped areas. 3.据最新报道，这次火车交通事故造成多名乘客死亡。 According to the latest report, the train accident resulted in the death of several passengers. 4.多呼吸新鲜空气有助于身体健康。 Plenty of fresh air contributes to good health. 5.他试图竞争学校学生会主席，但是没有成功。 He attempted to compete for the position of chairman of the Students' Union,
各专业的英文翻译
中国教育在线考研频道提供考研全方面信息指导及咨询服务，为您成功考研提供一切帮助。 哲学Philosophy 马克思主义哲学Philosophy of Marxism 中国哲学Chinese Philosophy 外国哲学Foreign Philosophies 逻辑学Logic 伦理学Ethics 美学Aesthetics 宗教学Science of Religion 科学技术哲学Philosophy of Science and Technology 经济学Economics 理论经济学Theoretical Economics 政治经济学Political Economy 经济思想史History of Economic Thought 经济史History of Economic 西方经济学Western Economics 世界经济World Economics 人口、资源与环境经济学Population, Resources and Environmental Economics 应用经济学Applied Economics 国民经济学National Economics 区域经济学Regional Economics 财政学（含税收学）Public Finance (including Taxation) 金融学（含保险学）Finance (including Insurance) 产业经济学Industrial Economics 国际贸易学International Trade 劳动经济学Labor Economics 统计学Statistics 数量经济学Quantitative Economics 中文学科、专业名称英文学科、专业名称 国防经济学National Defense Economics 法学Law 法学Science of Law 法学理论Jurisprudence 法律史Legal History 宪法学与行政法学Constitutional Law and Administrative Law 刑法学Criminal Jurisprudence
《自动化专业英语》中英文翻译-中文部分
第二部分控制理论 第1章 1.1控制系统的引入 人类控制自然力量的设计促进人类历史的发展，我们已经广泛的能利用这种量进行在人类本身力量之外的物理进程。在充满活力的20世纪中，控制系统工程的发展已经使得很多梦想成为了现实。控制系统工程队我们取得的成就贡献巨大。回首过去，控制系统工程主要的贡献在机器人，航天驾驶系统包括成功的实现航天器的软着陆，航空飞机自动驾驶与自动控制，船舶与潜水艇控制系统，水翼船、气垫船、高速铁路自动控制系统，现代铁路控制系统。 以上这些类型的控制控制系统和日常生活联系紧密，控制系统是一系列相关的原件在系统运行的基础上相互关联的构成的，此外控制系统存在无人状态下的运行，如飞机自控驾驶，汽车的巡航控制系统。对于控制系统，特别是工业控制系统，我们通常面对的是一系列的器件，自动控制是一个复合型的学科。控制工程师的工作需要具有力学，电子学，机械电子，流体力学，结构学，无料的各方面的知识。计算机在控制策略的执行中具有广泛的应用，并且控制工程的需求带动了信息技术的与软件工程的发展。 通常控制系统的范畴包括开环控制系统与闭环控制系统，两种系统的区别在于是否在系统中加入了闭环反馈装置。 开环控制系统 开环控制系统控制硬件形式很简单，图2.1描述了一个单容液位控制系统， 图2.1单容液位控制系统 我们的控制目标是保持容器的液位h在水流出流量V1变化的情况下保持在一定可接受的范围内，可以通过调节入口流量V2实现。这个系统不是精确的系统，本系统无法精确地检测输出流量V2，输入流量V1以及容器液位高度。图2.2描述了这个系统存在的输入（期望的液位）与输出（实际液位）之间的简单关系， 图2.2液位控制系统框图 这种信号流之间的物理关系的描述称为框图。箭头用来描述输入进入系统，以及
计算机专业英语课文翻译部分(第四版)
1.2 总线互连 总线是连接两个或多个设备的通信通路。总线的关键特征是，它是一条共享传输介质。多个设备连接到总线上，任一个设备发出的信号可以为其他所有连接到总线上的设备所接收。如果两个设备同时传送，它们的信号将会重叠，引起混淆。因此，一次只能有一个设备成功地（利用总线）发送数据。 典型的情况是，总线由多条通信通路或线路组成，每条线(路)能够传送代表二进制1和0的信号。一段时间里，一条线能传送一串二进制数字。总线的几条线放在一起能同时并行传送二进制数字。例如, 一个8位的数据能在8条总线线上传送。 计算机系统包含有多种不同的总线，它们在计算机系统层次结构的各个层次提供部件之间的通路。连接主要计算机部件(处理机, 存储器, I/O)的总线称为系统总线。系统总线通常由50~100条分立的(导)线组成。每条线被赋予一个特定的含义或功能。虽然有许多不同的总线设计，但任何总线上的线都可以分成三个功能组：数据线、地址线和控制线。此外可能还有为连接的模块提供电源的电源线。 数据线提供系统模块间传送数据的路径，这些线组合在一起称为数据总线。典型的数据总线包含8、16或32根线，线的数量称为数据总线的宽度。因为每条线每次传送1位，所以线的数目决定了每次能同时传送多少位。数据总线的宽度是决定系统总体性能的关键因素。 地址线用于指定数据总线上数据的来源和去向。例如，如果处理机希望从存储器中读一个字的数据，它将所需要字的地址放在地址线上。显然，地址总线的宽度决定了系统最大可能的存储器容量。 控制线用来控制对数据线和地址线的访问和使用。由于数据线和地址线被所有部件共享，因此必须用一种方法来控制它们的使用。控制信号在系统模块之间传送命令和定时信息。定时信息指定了数据和地址信息的有效性，命令信号指定了要执行的操作。 大多数计算机系统使用多总线，这些总线通常设计成层次结构。图1.3显示了一个典型的高性能体系结构。一条局部总线把处理机连接到高速缓存控制器，而高速缓存控制器又连接到支持主存储器的系统总线上。高速缓存控制器集成到连接高速总线的桥中。这一总线支持连接到：高速LAN、视频和图形工作站控制器，以及包括SCSI 和FireWire的局部外设总线的接口控制器。低速设备仍然由分开的扩充总线支持，用一个接口来缓冲该扩充总线和高速总线之间的通信流量。 PCI 外部设备互连是流行的高带宽的、独立于处理机的总线，它能够作为中间层或外围设备总线。当前的标准允许在66MHz频率下使用多达64根数据线，其原始传输速率为528MB/s, 或4.224Gbps。PCI被设计成支持各种各样基于微处理机的配置，包括单处理机和多处理机的系统。因此，它提供了一组通用的功能。PCI使用同步时序以及集中式仲裁方案。 在多处理机系统中，一个或多个PCI配置可通过桥接器连接到处理机的系统总线上。系统总线只支持处理机/高速缓存单元、主存储器以及PCI桥接器。使用桥接器使得PCI独立于处理机速度，又提供快速接收和传送数据的能力。 2.1 光存储介质：高密度存储器 2.1.1 光盘 光盘技术最终可能使磁盘和磁带存储淘汰。用这种技术，磁存储器所用的读/写头被两束激光代替。一束激光通过在光盘上刻制微小的凹点，对记录表面进行写；而另一束激光用来从光敏感的记录表面读取数据。由于光束容易被偏转到光盘上所需要的位置，所以不需要存取臂。 对用户而言，光盘正成为最有吸引力的选择。它们(光盘)对环境变化不太敏感，并且它们以每兆字节比磁盘低得多的存储器价格提供更多的直接存取存储器。光盘技术仍在出现，并且还需要稳定；然而，目前有三种主要类型的光盘。它们是CD-ROM、WORM盘和磁光盘。 CD-ROM 1980年引入的，非常成功的CD，或紧密盘是设计来提高音乐的录音重放质量的光盘。为了制作一张CD，把音乐的模拟声音转换成等价的数字声音，并且存储在一张4.72英寸的光盘上。在每张光盘上可以用数字格式（用20亿数字位）记录74分钟的音乐。因为它的巨大存储容量，计算机工业的企业家们立刻认
专业英语原文和翻译
Basic Control Actions and Industrial Automatic Control An automatic controller compares the actual value of the plant output with the desired value, determines the deviation, and produces a control signal which will reduce the deviation to zero or to a small value.The manner in which the automatic conroller produces the control signal is called the control action. Classifications of industrial automatic controllers Induetrial automatic controllers may be classified according to their control action as: ·two-position or on-off controllers; ·proportional controllers; ·integral controllers; ·proportional-plus-integral controllers; ·proportional-plus-derivative controllers; ·proportional-plus-derivative-plus-integral controllers. Most industrial automatic controllers use eletricity or pressurized fluid such as oil or air as power sources. Automatic controllers may also be classified according to the kind of power employed in the operation, such as pneumatic controllers, hydraulic controllers, or electronic controllers.What kind of controller to use must be decided by the nature of the plant and the operating conditions,including such considerations as safety, availability, reliability, accuracy, weight, and size? Elements of industrial automatic controllers An automatic controller must detect the actuating error signal, which is usually at a very low power level, and amplify it to a sufficiently high level. Thus, an amplifier is necessary. The output of an automatic controller is fed to a power device, such as a pneumatic motor or valve, a hydraulic motor, or an electric motor. The controller usually consists of an error detector and amplifier. The measuring element is a device that converts the output variable into another suitable variable, such as a displacement, pressure, or electric signal, which can be used for comparing the output to the reference input signal. This element is in the feedback path of the closed-loop system. The set point of the controller must be converted to a reference input of the same units as the feedback signal from the measuring element. The amplifier amplifies the power of the actuating error signal, which in turn operates the actuator. The actuator is an element which alters the input to the plant according to the control signal so that the feedback signal may be brought into correspondence with the reference input signal. Self-operated controllers In most industrial automatic controllers, separate units are used for the measuring element and for the actuator. In a very simple one, however, such as a self-operated controller, these elements are assembled in one unit. Self-operated controllers utilize power developed by the measuring element and are very simple and inexpensive. The set point is determined by the adjustment of the spring force. The controlled pressure is measured by the diaphragm. The actuating error signal is the net force acting on the diaphragm. Its position determines the valve opening. The operation of self-operated controller is as follows: Suppose that the output pressure is lower than the reference pressure, as determined by the set point. Then the downward spring force is greater than the upward pressure force, resulting in a downward movement of the diaphragm. This increases the flow rate and raises the output pressure.