计算机英语(第3版)课文翻译与课后答案
课后答案：Unit One/Section AI. Fill in the blanks with the information given in the text:1. Charles Babbage; Augusta Ada Byron2. input; output3. VLSI4. workstations; mainframes5. vacuum; transistors6. instructions; software7. digit; eight; byte8. microminiaturization; chipII. Translate the following terms or phrases from English into Chinese and vice versa:1. artificial intelligence 人工智能2. paper-tape reader 纸带阅读器3. optical computer 光计算机4. neural network 神经网络5. instruction set 指令集6. parallel processing 并行处理7. difference engine 差分机8. versatile logical element 通用逻辑元件9. silicon substrate 硅衬底10. vacuum tube 真空管11. 数据的存储与处理the storage and handling of data12. 超大规模集成电路very large-scale integrated circuit13. 中央处理器central processing unit14. 个人计算机personal computer15. 模拟计算机analogue computer16. 数字计算机digital computer17. 通用计算机general-purpose computer18. 处理器芯片processor chip19. 操作指令operating instructions20. 输入设备input deviceIII. Fill in each of the blanks with one of the words given in the following list, making changes if necessary:We can define a computer as a device that accepts input, processes data, stores data, andproduces output. According to the mode of processing, computers are either analog or digital.They can also be classified as mainframes, minicomputers, workstations, or microcomputers.All else (for example, the age of the machine) being equal, this categorization provides someindication of the computer’s speed, size, cost, and abilities.Ever since the advent of computers, there have been constant changes.First-generationcomputers of historic significance, such as UNIV AC (通用自动计算机), introduced in theearly 1950s, were based on vacuum tubes. Second-generation computers, appearing in theearly 1960s, were those in which transistors replaced vacuum tubes. In third-generationcomputers, dating from the 1960s, integrated circuits replaced transistors. In fourth-generationcomputers such as microcomputers, which first appeared in the mid-1970s, large-scale integration enabled thousands of circuits to be incorporated on one chip. Fifth-generationcomputers are expected to combine very-large-scale integration with sophisticated approachesto computing, including artificial intelligence and true distributed processing.IV. Translate the following passage from English into Chinese:计算机将变得更加先进，也将变得更加容易使用。
语音识别的改进将使计算机的操作更加容易。
虚拟现实，即使用所有人类官能与计算机进行交互的技术，也将有助于创建更好的人机接口。
人们正在开发其他的奇异计算模型，包括使用生物机体的生物计算、使用具有特定属性的分子的分子计算，以及使用遗传基本单位DNA（脱氧核糖核酸）存储数据和执行操作的计算。
这些都是可能的未来计算平台的例子，而它们迄今还能力有限或完全属于理论范畴。
科学家们研究它们，是因为嵌入硅中的电路的微小型化受到物理限制。
还有一些限制与甚至最微小的晶体管也会产生的热量有关。
Unit Two: Computer ArchitectureUnit Two/Section AI．Fill in the blanks with the information given in the text:1. input; output; storage2. Basic Input/Output System3. flatbed scanners; hand-held scanners4. LCD-based5. dot-matrix printers; inkjet printers6. disk drives; memory7. volatile8. serial; parallelII. Translate the following terms or phrases from English into Chinese and vice versa:1. function key 功能键，操作键2. voice recognition module 语音识别模块3. touch-sensitive region 触敏区4. address bus 地址总线5. flatbed scanner 平板扫描仪6. dot-matrix printer 点阵打印机（针式打印机）7. parallel connection 并行连接8. cathode ray tube 阴极射线管9. video game 电子游戏10. audio signal 音频信号11. 操作系统operating system12. 液晶显示（器）LCD (liquid crystal display)13. 喷墨打印机inkjet printer14. 数据总线data bus15. 串行连接serial connection16. 易失性存储器volatile memory17. 激光打印机laser printer18. 磁盘驱动器disk drive19. 基本输入/输出系统BIOS (Basic Input/Output System)20. 视频显示器video displayIII. Fill in each of the blanks with one of the words given in the following list, making changes if necessary:CD-ROM stands for compact disc read-only memory. Unlike floppy and hard disks, which use magnetic charges to represent 1s and 0s, optical discs use reflected light. On aCD-ROM disc, 1s and 0s are represented by flat areas and bumpy (高低不平的) areas (called“pits”) on its bottom surface. The CD-ROM disc is read by a laser that projects a tiny beam oflight on these areas. The amount of reflected light determines whether the area represents a 1or a 0.Like a commercial CD found in music stores, a CD-ROM is a “read-only” disc.Read-only means it cannot be written on or erased by the user. Thus, you as a user haveaccess only to the data imprinted (压印) by the publisher.A single CD-ROM disc can store 650 megabytes (兆字节) of data. That is equivalent to451 floppy disks. With that much information on a single disc, the time to retrieve or accessthe information is very important. An important characteristic of CD-ROM drives is theiraccess rate.IV. Translate the following passage from English into Chinese:调制解调器是在模拟和数字信号之间进行转换的设备。
计算机英语(第3版)课文翻译和课后答案
《计算机英语（第3版）》参考译文第一单元：计算机与计算机科学课文A：计算机概览一、引言计算机是一种电子设备，它能接收一套指令或一个程序，然后通过对数字数据进行运算或对其他形式的信息进行处理来执行该程序。
要不是由于计算机的发展，现代的高科技世界是不可能产生的。
不同类型和大小的计算机在整个社会被用于存储和处理各种数据，从保密政府文件、银行交易到私人家庭账目。
计算机通过自动化技术开辟了制造业的新纪元，而且它们也增强了现代通信系统的性能。
在几乎每一个研究和应用技术领域，从构建宇宙模型到产生明天的气象报告，计算机都是必要的工具，并且它们的应用本身就开辟了人们推测的新领域。
数据库服务和计算机网络使各种各样的信息源可供使用。
同样的先进技术也使侵犯个人隐私和商业秘密成为可能。
计算机犯罪已经成为作为现代技术代价组成部分的许多风险之一。
二、历史第一台加法机是法国科学家、数学家和哲学家布莱斯?帕斯卡于1642年设计的，它是数字计算机的先驱。
这个装置使用了一系列带有10个齿的轮子，每个齿代表从0到9的一个数字。
轮子互相连接，从而通过按照正确的齿数向前转动轮子，就可以将数字彼此相加。
17世纪70年代，德国哲学家和数学家戈特弗里德?威廉?莱布尼兹对这台机器进行了改良，设计了一台也能做乘法的机器。
法国发明家约瑟夫―玛丽?雅卡尔，在设计自动织机时，使用了穿孔的薄木板来控制复杂图案的编织。
在19世纪80年代期间，美国统计学家赫尔曼?何勒里斯，想出了使用类似雅卡尔的木板那样的穿孔卡片来处理数据的主意。
通过使用一种将穿孔卡片从电触点上移过的系统，他得以为1890年的美国人口普查汇编统计信息。
1、分析机也是在19世纪，英国数学家和发明家查尔斯?巴比奇，提出了现代数字计算机的原理。
他构想出旨在处理复杂数学题的若干机器，如差分机。
许多历史学家认为，巴比奇及其合伙人，数学家奥古斯塔?埃达?拜伦，是现代数字计算机的真正先驱。
巴比奇的设计之一，分析机，具有现代计算机的许多特征。
“计算机英语教程（第三版）”练习答案及参考
“计算机英语教程（第三版）”练习答案及参考电子工业出版社“计算机英语教程（第三版）”练习答案第1课一、判断正误:1. F,2. F,3. T,4. T,5. T,6. T,7. F,8. T,9. T, 10. T二、根据课文内容填空:1. microprocessor, memory, disk drives, displays and keyboard2. the display screen3. the keyboard4. to store the BIOS instructions and the Configuration Utility program5. 61446. monochrome and color7. hard disk drives and floppy disk drives 或 fixed disk drives anddiskette drives8. letter keys, punctuation keys, a spacebar and function, numeric, andarrow keys9. mouse10. baud rate三、指出下列句中的定语从句，然后把句子译成汉语。
1. where we put our computer我们放计算机的那个房间很大。
2. who are requiring the full color capabilities of the color VGA monitor那些要求彩色显示器具有全彩色性能的用户，将发现本彩色VGA 显示器是完美的选择。
3. why there are heat losses in a steam engine你知道为什么蒸气发动机中会有热量丢失吗？4. which allows electric current to flow easily能让电流容易流过的材料叫导体。
5. whose father works in AAA computer company汤姆就是那个他父亲在AAA计算机公司工作的学生。
计算机英语第三版(课文翻译+课后答案)
Unit One/Section AI.Fill in the blanks with the information given in the text:1.Charles Babbage;Augusta Ada Byron2.input;output3.VLSI4.workstations;mainframes5.vacuum;transistors6.instructions;software7.digit;eight;byte8.microminiaturization;chipII.Translate the following terms or phrases from English into Chinese and vice versa:1.artificial intelligence人工智能2.paper-tape reader纸带阅读器3.optical computer光计算机4.neural network神经网络5.instruction set指令集6.parallel processing并行处理7.difference engine差分机8.versatile logical element通用逻辑元件9.silicon substrate硅衬底10.vacuum tube真空管11.数据的存储与处理the storage and handling of data12.超大规模集成电路very large-scale integrated circuit13.中央处理器central processing unit14.个人计算机personal computer15.模拟计算机analogue computer16.数字计算机digital computer17.通用计算机general-purpose computer18.处理器芯片processor chip19.操作指令operating instructions20.输入设备input deviceIII.Fill in each of the blanks with one of the words given in the following list,makingchanges if necessary:We can define a computer as a device that accepts input,processes data,stores data,andproduces output.According to the mode of processing,computers are either analog or digital.They can also be classified as mainframes,minicomputers,workstations,or microcomputers.All else(for example,the age of the machine)being equal,this categorization provides someindication of the computer’s speed,size,cost,and abilities.Ever since the advent of computers,there have been constant changes.First-generationcomputers of historic significance,such as UNIVAC(通用自动计算机),introduced in theearly 1950s,were based on vacuum tubes.Second-generation computers,appearing in theearly 1960s,were those in which transistors replaced vacuum tubes.In third-generationcomputers,dating from the 1960s,integrated circuits replaced transistors.In fourth-generationcomputers such as microcomputers,which first appeared in the mid-1970s,large-scaleintegration enabled thousands of circuits to be incorporated on one chip.Fifth-generationcomputers are expected to combine very-large-scale integration with sophisticated approachesto computing,including artificial intelligence and true distributed processing.IV.Translate the following passage from English into Chinese:计算机将变得更加先进，也将变得更加容易使用。
计算机英语实用教程第三版课后练习题含答案
计算机英语实用教程第三版课后练习题含答案第一章练习题答案1. What is the difference between a CPU and a GPU?A CPU (Central Processing Unit) is a general-purpose processor that performs tasks that require complex arithmetic and logical operations. A GPU (Graphics Processing Unit), on the other hand, is a specialized processor that is designed to handle tasks that involve highly parallelizable computations, such as those required for rendering graphics.2. What is the difference between RAM and ROM?RAM (Random Access Memory) is a type of memory that stores data temporarily while the computer is running. RAM is volatile, meaning that its contents are erased when the computer is turned off. ROM (Read-Only Memory), on the other hand, is a type of memory that stores data permanently, even when the computer is turned off. ROM is non-volatile, meaning that its contents are retned even when there is no power.3. What is the difference between a bit and a byte?A bit is the smallest unit of digital information, represented by a binary digit (0 or 1). A byte, on the other hand, is a unit of digital information that consists of eight bits. Bytes are commonly used to represent characters, such as letters and numbers.4. What is the purpose of an operating system?An operating system (OS) is a software program that manages the resources of a computer, including the CPU, memory, storage, and devices such as printers and displays. The purpose of an operating system is to provide an environment in which applications can run and interact with the hardware without directly accessing the underlying hardware.5. What is the difference between a compiler and an interpreter?A compiler is a program that translates the source code of a program into executable code that can be run on a specific computer platform. The resulting executable code can be run multiple times without the need for recompilation. An interpreter, on the other hand, is a program that reads and executes source code instructions one at a time. Interpreted code is typically slower than compiled code, but does not require the extra step of compilation before it can be run.第二章练习题答案1. What is the difference between a LAN and a WAN?A LAN (Local Area Network) is a network that connects computers and other devices that are located in the same physical location, such as an office building or a home. A WAN (Wide Area Network), on the other hand, is a network that connects computers and other devices that are located in different physical locations, often separated by vast distances.2. What is a router and how does it work?A router is a device that connects two or more networks together and forwards data between them. Routers use routing tables to determine thebest path for data to take between networks, and use protocols such as TCP/IP to communicate with other devices on the network.3. What is the difference between TCP and UDP?TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both protocols used for transmitting data over the internet. TCP is a connection-oriented protocol, which means that it establishes avirtual circuit between two endpoints over which data can be transmitted. TCP uses error correction and flow control to ensure that data arrivesat its destination correctly and in the correct order. UDP, on the other hand, is a connectionless protocol that does not establish a virtual circuit between endpoints. UDP does not provide error correction or flow control, but is often used in situations where speed and simplicity are more important than reliability.4. What is a DNS server?A DNS (Domn Name System) server is a special type of server that translates domn names into IP addresses. When a user enters a domn name into their web browser, the browser sends a request to a DNS server to find the corresponding IP address for that domn name. The DNS serverthen returns the IP address to the browser, which can then connect tothe website.5. What is a firewall and how does it work?A firewall is a security device that is used to protect a networkfrom unauthorized access. Firewalls can be implemented as hardware or software, and typically work by examining incoming and outgoing network traffic and blocking any traffic that does not meet a set of predefinedrules. Firewalls can be configured to block specific types of traffic, such as traffic from certn IP addresses or traffic that uses a certn protocol. Firewalls can also be configured to allow or deny access to specific network resources based on user or device credentials.。
计算机专业英语教程(第三版)答案
附录5练习参考答案Unit 1[Ex 1] 1. F 2. T 3. T 4. F 5. T 6. T 7. T 8. T 9. T 10. F[Ex 2] 1. input, storage, processing, and output 2. power; speed; memory3. central processing unit4. internal; primary; memory5. keyboard; central processing unit; main memory; monitor[Ex 3] A. 1. F 2. D 3. G 4. C 5. B 6. A 7. E 8. HB. 1. user 2. monitor 3. data 4. keyboard 5. data processing6. information7. computer8. memory[Ex 4] 1. input device 2. screen 3. manipulates 4. instructions 5. retrieve6. code7. hard copy8. function[Ex 5] 1. T 2. T 3. F 4. F 5. T 6. F 7. T 8. FUnit 2[Ex 1] 1. T 2. F 3. T 4. F 5. T 6. T 7. T 8. F[Ex 2] 1. sizes, shapes, processing capabilities2. supercomputers, mainframe computers, minicomputers, microcomputers3. mainframe computer4. microcomputers, storage locations5. protables, laptop computers/notebook/palm-sized computer.desktop workstations6. semiconductor7. CPU, memory, storage, devices, processing, users8. microprocessor chip[Ex 3] A. 1. C 2. A 3. H 4. I 5. E 6. F 7. G 8. B2. 1. capacity 2. device3. laptop computer4. Portable computers5. Silicon6. semiconductor7. workstation8. voltage9. RAM 10. ROM[Ex 4] 1. portable 2. access 3. main memory 4. sophisiticated programs5. processing capability6. instructions7. computation8. computer professional[Ex 5] 1. T 2. T 3. T 4. F 5. F 6. T 7. F 8. T 9. F 10. T 11. F 12. T13. T 14. TUnit 3[Ex 1] 1. T 2. F 3. T 4. T 5. T 6. T 7. F 8. F 9. T 10. F 11. T 12. F13. F 14. T[Ex 2] 1. microprocessor 2. bus 3. register 4. control unit 5. processor6. binary7. arithmetic, logical8. milliseconds, microseconds, nanoseconds.9. instruction 10. execution 11. megahertz 12. wordsize[Ex 3] A. 1. F 2. A 3. J 4. C 5. D 6. E 7. H 8. I 9. B 10. G2. 1. Storage 2. chip3. registers4. ALU5. bus6. control unit7. machine language 8. binary system 9. bits 10. computer program[Ex 4] 1. configuration 2. converts 3. data buses 4. characters5. decodes6. synchronize7. circuitry8. internal clock[Ex 5] 1. T 2. F 3. F 4. T 5. T 6. F 7. T 8. T 9. T 10 FUnit 4[Ex 1] 1. F 2. T 3. T 4. T 5. F 6. T 7. F 8. T 9. T 10. F 11. T 12. T13. F 14. F 15. T 16. F 17. T 18. F 19. T 20. F 21. T 22. F[Ex 2] 1. main memory 2. RAM 3. diskettes/floppy disks; hard disks4. chips5. parity6. expanded, extended7. monochrome8. cache 9. ROM 10. updated[Ex 3] A. 1. B 2. E 3. C 4. J 5. I 6. H 7. A 8. F 9. G 10 D2. 1. secondary srorage 2. buffer3. access4. code5. diskette6. slots7. terminals8. motherboard9. bytes 10. screen[Ex 4] 1. desktop 2. software 3. animation 4. transferred 5. sophisticated6. compatible7. cache8. upgrade[Ex 5] 1. T 2. F 3. T 4. T 5. F 6. T 7. F 8. T 9. T 10. T 11. T 12. T13. T 14. F 15. F 16. TUnit 5[Ex 1] 1. T 2. F 3. F 4. F 5. T 6. T 7. T 8. F 9. F 10. T 11. F 12. F13. T 14. T[Ex 2] 1. floppy disks 2. disk drive 3. revolutions 4. bits 5. megabyte,gigabyte, terabyte 6. density 7. sectors 8. 1.44[Ex 3] A. 1. H 2. F 3. E 4. D 5. C 6. A 7. B 8. GB. 1. read/write heads 2. sector 3. magnetic tape 4. index5. disk drives6. format7. clone8. tracks[Ex 4] 1. increment 2. spins 3. activate 4. specification 5. magnetize6. overwrite7. contaminated8. mechanism[Ex 5]1.有意为技术服务人员留下的2.抛弃、丢失或毁灭的数据都进入到数据接收器中3.远远不能覆盖绝大多数嫌疑人4.真正奇才所掌握的技术5.文件和程序6. 1. 系统详情、扩展其性能5. 敏感信息的人7.滞缓的特性和控制开发的复杂性8.非常巧妙的权宜之计，旨在解决很棘手的问题9.不能有效与他人沟通的人10.一个程序、数据结构或全部程序的11.交叉指向不合适的新闻组12.打免费长途电话了；通信网络，但不单指通信网络13.眼睛疲劳14.无关紧要或令人讨厌的琐碎问题15.不会有人发现这些漏洞的，或真的发现了也不会利用16.受人雇佣，为测试系统的安全性而攻入某个地方17.那种使用许多GOTO、例外或另外的“非结构的”分支构造18.不能定期运行适当的抑制程序19.某种非常友好程序的20.远在没有正式发行之前21.该技术也许不能发挥作用。
计算机英语（第3版）复习刘艺王春生课后习题
计算机英语（第3版）复习刘艺王春生课后习题Unit One Computer and Computer Science计算机与计算机科学/ Section A参考答案I. Fill in the blanks with the information given in the text:1.Charles Babbage; Augusta Ada Byron2.input; output3.VLSI4.workstations; mainframes5.vacuum; transistors6.instructions; software7.digit; eight; byte8.microminiaturization; chipII. Translate the following terms or phrases from English into Chinese and vice versa:1.artificial intelligence人工智能2.paper-tape reader纸带阅读器3.optical computer光计算机4.neural network神经网络5.instruction set指令集6.parallel processing并行处理7.difference engine差分机8.versatile logical element通用逻辑元件9.silicon substrate硅衬底10.vacuum tube真空管11.数据的存储与处理the storage and handling of data12.超大规模集成电路very large-scale integrated circuit13.中央处理器central processing unit14.个人计算机personal computer15.模拟计算机analogue computer16.数字计算机digital computer17.通用计算机general-purpose computer / versatile computer18.处理器芯片processor chip19.操作指令operating instructions20.输入设备input device III. Fill in each of the blanks with one of the words given in the following list, making changes if necessary:We can define a computer as a device that accepts input, processes data, stores data, and produces output. According to the mode of processing, computers are either analog or digital. They can also be classified as mainframes, minicomputers, workstations, or microcomputers. All else (for example, the age of the machine) being equal, this categorization provides some indication of the computer’s speed, size, cost, and abilities.Ever since the advent of computers, there have been constant changes. First-generation computers of historic significance , such as UNIVAC (通用自动计算机), introduced in the early 1950s, were based on vacuum tubes. Second-generation computers, appearing in the early 1960s, were those in which transistors replaced vacuum tubes. In third-generation computers, dating from the 1960s, integrated circuits replaced transistors. In fourth-generation computers such as microcomputers, which first appeared in the mid-1970s, large-scale integration enabled thousands of circuits to be incorporated on one chip. Fifth-generation computers are expected to combine very-large-scale integration with sophisticated approaches to computing, including artificial intelligence and true distributed processing.IV. Translate the following passage from English into Chinese: 计算机将变得更加先进，也将变得更加容易使用。
“计算机英语教程(第三版)”练习答案及参考
电子工业出版社“计算机英语教程（第三版）”练习答案第1课一、判断正误:1. F,2. F,3. T,4. T,5. T,6. T,7. F,8. T,9. T, 10. T二、根据课文内容填空:1. microprocessor, memory, disk drives, displays and keyboard2. the display screen3. the keyboard4. to store the BIOS instructions and the Configuration Utility program5. 61446. monochrome and color7. hard disk drives and floppy disk drives 或 fixed disk drives anddiskette drives8. letter keys, punctuation keys, a spacebar and function, numeric, andarrow keys9. mouse10. baud rate三、指出下列句中的定语从句，然后把句子译成汉语。
1. where we put our computer我们放计算机的那个房间很大。
2. who are requiring the full color capabilities of the color VGA monitor那些要求彩色显示器具有全彩色性能的用户，将发现本彩色VGA显示器是完美的选择。
3. why there are heat losses in a steam engine你知道为什么蒸气发动机中会有热量丢失吗？4. which allows electric current to flow easily能让电流容易流过的材料叫导体。
5. whose father works in AAA computer company汤姆就是那个他父亲在AAA计算机公司工作的学生。
武汉微博教育整理分享—计算机英语第三版课后答案(二)
武汉微博教育整理分享—计算机英语第三版课后答案（二）课后答案Unit 4 Computer Language and ProgrammingSection A I．Fill in the blanks with the information given in the text:1．artificial; instructions2．low-level; high-level3．low-level4．Machine5．functional; logic6．Statement7．Module8．digitalII．Translate the following terms or phrases from English into Chinese andvice versa:1．storage register 存储寄存器2．function statement 函数语句3．program statement 程序语句4．object-oriented language 面向对象语言5．assembly language 汇编语言6．intermediate language 中间语言，中级语言7．relational language 关系（型）语言8．artificial language 人造语言9．data declaration 数据声明10．SQL 结构化查询语言11．executable program 可执行程序12．program module 程序模块13．conditional statement 条件语句14．assignment statemen t赋值语句15．logic language 逻辑语言16．machine language 机器语言17．functional language 函数式语言18．programming language 程序设计语言19．run a computer program 运行计算机程序20．computer programme r 计算机程序设计员III．Fill in each of the blanks with one of the words given in the following list, making changes if necessary:A programming language is a language used to write instructions for the computer. It lets the programmer express data processing in a symbolic manner without regard to machine-specific details.The difficulty of writing programs in the machine language of 0s and 1s led first to the development of assembly language, which allows programmers to use mnemonics for instructions and symbols for variables. Such programs are then translated by a program known as an assembler into the binary encoding used by the computer. Other pieces of system software known as linking loaders combine pieces of assembled code and load them into the machine’s main memory unit, where they are then ready for execution. The concept of linking separate pieces of code was important, since it allowed “libraries” of programs to be built up to carry out common tasks—a first step toward the increasingly emphasized notion of software reuse. Assembly language was found to be sufficiently inconvenient that higher-level languages (closer to natural languages) were invented in the 1950s for easier, faster programming; along with them came the need for compilers, programs that translate high-level language programs into machine code. As programming languages became more powerful and abstract, building efficient compilers that createhigh-quality code in terms of execution speed and storage consumption became an interesting computer science problem in itself.IV．Translate the following passage from English into Chinese.One especially powerful feature of OOP (object-oriented programming) languages is a property which is known as inheritance. Inheritance allows an object to take on the characteristics and functions of other objects to which it is functionally connected. Programmers connect objects by grouping them together in different classes and by grouping the classes into hierarchies. These classes and hierarchies allow programmers to define the characteristics and functions of objects without needing to repeat source code, the coded instructions in a program. Thus, using OOP languages can greatly reduce the time it takes for a programmer to write an application, and also reduce the size of the program. OOP languages are flexible and adaptable, so programs or parts of programs can be used for more than one task. Programs written with OOP languages are generally shorter in length and contain fewer bugs (缺陷), ormistakes, than those written with non-OOP languages.面向对象程序设计语言的一个特别强大的功能，是称为继承的特性。
计算机英语实用教程(第三版)课件-unit3
计算机英语实用教程
（第三版）
Unit 3 Memory
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New WordsNew Βιβλιοθήκη ordsNew Words
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请做课后练习 答案在第二版的附录中
推荐参考图书
《计算机英语教程》，北京，人民邮电出版社：国家级十五规划教材 《电脑英语掌中宝》，南京，东南大学出版社：获“华东地区大学出版社教材专著二等奖” 《计算机专业英语教程》，北京，高等教育出版社 《电子商务专业英语教程》，北京，高等教育出版社 《电脑英语五周通》，西安，西安电子科技大学出版社 《电脑英语词汇通》，北京，人民邮电出版社 《计算机实用英语》，西安，世界图书出版公司 《计算机专业英语教程》，北京，清华大学出版社 《电子商务专业英语教程》，北京，清华大学出版社 《信息管理专业英语教程》，北京，清华大学出版社 《电气工程专业英语教程》，北京，清华大学出版社 《电子商务专业英语实用教程》，杭州，浙江大学出版社 《计算机专业英语教程》，北京，科学出版社 《饭店酒店管理专业英语教程》，北京，清华大学出版社 《法律专业英语教程》，北京，清华大学出版社 《旅游专业英语教程》，北京，清华大学出版社 《大学英语听说新体验（带mp3光盘）》，杭州，浙江大学出版社 《大学英语学习指南》，北京，外语教学与研究出版社 《大学体验英语学与练》（丛书，四册），天津，南开大学出版社 《大学体验英语词汇通》，天津，南开大学出版社
计算机英语(课文内容翻译15分)
计算机英语课文内容翻译( 15 分)CHAPTER 11.1We build computer to solve problems. Early computer solved mathematical and engineering problems ,and later computers emphasized information processing for business applications. Today, computers alsocontrol machines as diverse as automobile engines, robots, and microwave ovens. A computer system solves a problem from any of these domains by accepting input, processing it, and producing output. Figure 1-1illustrates the function of a computer system.Figure 1-2 shows these componentsin a block diagram. The lines between the blocks represent the flow of information flows from one component to another on the bus, which is simply a group of wires connecting the components. Processing occursin the CPU and main memory. The organization in Figure 1-2, with the components connectedto each other by the bus,is common. However, other configurations are possible as well.The classification just described is basedon physical size as opposed to storage size. A computer system user is generally more concerned with storage size, because thaist a more direct indication of the amount ofuseful work that the hardware can perform.Speed of computationis another characteristic that is important to the user. Generally speaking, users want a fast CPU and large amounts of storage, but a physically small machinefor the I/O devices and main memor.y1.2A processor is a functional unit that interprets and carries out instructions. Every processorcomes with a unique set of operations such as ADD, STORE, or LOAD that represent the processor set. Computers ins designers arefond of calling their computers machines, so theinstruction set is sometimes referred to asmachine instructions and the binary language in which they are written is called machine language! [1] You shouldn 'ctonfuse the processor 'in s truction set with the instructions found in high-level programming languages, such as BASIC or Pascal.The control unit is the functional unit that is responsible for supervising the operation of the entire computer system. In some ways, it is analogous to a telephoneswitch-board with intelligence becauseit makes the connections betweenvarious functional units of the computer system and calls into operation each unit that is required by the program currently in operationThe arithmetic and logic unit (ALU) is the functional unit that provides the computer with logical and computational capabilities. Data are brought into the ALU by the control unit, and the ALU performs whatever arithmetic or logic operations are required to help carry out the instruction1.3Below the L1 cache is the Level 2,or L2 cache. In today ' s P-ecnlatisusmprocessors ,the L2 cacheis usually on the processor chipitself .In fact ,If you could lift the lid of a Pentium or Athlon processor and look atthe silicon die itself under a microscope you might be surprised to find that the biggest percentage of chip areawas taken up by the cache memoriesBelow the L1 cache is the Level 2,or L2 cache. In today 's Pen-ticulamss processors ,the L2 cacheisusually on the processor chipitself .In fact ,If you could lift the lid of a Pentium or Athlon processor and look atthe silicon die itself under a microscope you might be surprised to find that the biggest percentage of chip area was taken up by the cache memorie[s.The virtual memory interface is shown in Fig.1-6. A real memory of 16M bytes and a virtual memory of 2G bytes are shown for illustration; many modern virtual memory systems are much larger than this. Virtual-memory space is divided into equal-sized groups called pages. A page in a modern computer is 1K, 2K, or 4K bytes. Real memory is also divided into the same equal-sizedgroups, called page frames. When information is moved between virtual-memory space and real-memory space, a complete page is moved.Section 3 discussed how virtual memory extends the address spaceof a processor. However, the latency of real memory is too long to support high-performance processors.Even with the high-speed DRAMs used today for real memory, something must be done to overcome this latency problem.CHAPTER 22.1Multiprogramming, which was developed to improve performance, also allows time sharing. Time shared operating systems allow many users (from one to several hundred) to use a computer system inter-leavingly at the same time. Other operating systems types include real time systems and multiprocessor systems.The management of resources in a computer system is another major concern of the operating system. Obviously, a program cannot use a device if that hardwareis unavailable. As we have seen, the operational software oversees the execution of all programs. It also monitors the devices being used. To accomplish this, it establishes a table in which programs are matched against the devices they are using or will use .The operating system checks this table to approve or deny use of a specific device.In effect , the program undergoing execution signals the operating system that an I/O operation is desired, using a specific I/O device. The controlling software calls on the IOCS software to actually complete the I/O operation. Considering the level of I/O activity in most programs, the IOCS instructions are extremely vital.CHAPTER 33.1Selecting a PC for home or business use must begin with the all-important question “What do I want the system to do?” Once you' ve determined what tasks the system will be used for, you must choose among the software and hardware alternatives available. If yo'ure not really sure what you want a system to do, you should think twice about buying one. Computer systems that are configured to match the requirements of certain applications (such as preparing a novel) often perform poorly at ot hers (playing power-hungry multimedia games, for example). You can easily make expensive mistakes if yo'u re uncertain about what you want a system to do.When you take possession of a new computer system, you should find that most of the hardware and software you need are alreadyin place. You' ll need to connect the components and start the systemup;then, you' ll be off and running. If your system does not include a piece of hardware or software that you want itto have, you can usually buy and install it yourself relatively easily.A final, but optional, step in setting up your new system is customizing the settings. Most PCs include options for background images, color schemes, themes, screen savers, screen resolution, the order of items on the menus, and soforth. In Windows, the desktop options are accessible through the Control Panel, as shown in Fig.3-1, You can also use the Control Panel to set up your network and Internet settings.3.2The Windows desktop appears on thescreen after a computerusing the Windows operating system has completed the boot process. The desktop is where documents, folders, programs, and other objects are displayed when they are being used, similar to the way documents and file folders are laid on a desk when they are being used. Thought the appearanceof the Windows desktop can be customized, all desktops contain common elements, such as desktop icons, the taskbar, the Start button, windows, and task buttons (see Fig.3-2).The principle component of the GUI is the window. As mentioned earlier, a window is a rectangular area of information that is displayed on the screen. These windows can contain programs and documents, as well as menus, dialog boxes,icons, and a variety of other types of data.A menu is a set of options--usually text based—from which the user can choose to initiate a desiredaction in a program. At the top of many windows is a menu bar showing the main menu categories (see Fig.3-2). Pull-down menus (also called drop--down menus) display on the screen when the user selects an item on the menu bar. As shown on the right-most screen in Fig.3-2, in some Microsoft programs (such as Windows and someversions of Microsoft Office) a feature called personalizedmenus can be used.CHAPTER 44.1The OSI model is shown in Fig.4-1 (minus the physical medium). This model is based on a proposal developed by the International Standards Organization (ISO) as the first step toward international standardization of the protocols used in the various layers. The model is called the ISO OSI (Open System Interconnection) Reference Model because it deals with connecting open systems—that is, systems that are open for communication with other systems.There are two end-to-end protocols in the transport layer, one of which is TCP (Transmission Control Protocol), another is UDP (User Datagram Protocol). TCP is a connection-oriented protocol that allows a byte stream originating on one machine to be delivered without error on any other machine in the internet.UDP is an unreliable, connectionless protocol for applications that do not want TCP ' s s of flow control and wish to provide their own.The network layer defines an official packet format and protocol called IP (Internet Protocol). The job of the network layer is to deliver IP packets where they are supposed to go.4.2The most widespread topology for LANs designed to function as data communication for theinterconnection of local computer-basedequipment is the star topology, in which the major equipments used to connect a variety of computer-based devices arehubs or switches. Typical LAN product of using the star topology is the most famous Ethernet, which dominates the LAN world toda.yThe 100Base-T Ethernet which is known as Fast Ethernet has the same topology as 10Base-T showing in Fig.4-3. Using this topology, we can build a fast Ethernet and need NICs of 100Mb/s and hub of 100Mb/s and don' t need cabling any more .Switches are basically multi-port bridges, but share some characteristics with routers.Like routers, switches work by dividing up the network into a number of segments, each of which can operate without interference from traffic local to any of the other segments.Switching is performed at layer 2 of the seven-layer model-the same as bridging. Since it is performed at layer 2, the MAC address is used, which is independent of protocol address. Like a bridge, a switch learns which address reside on each of its ports and then switches data appropriately. A switch can be designed using conventional microprocessors or dedicated ASIC (Application-Specific Integrated Circuit) technology.CHAPTER 55.1ARPAnet is abbreviated from “ AdvancedResearch Projects Agency Network ” .Landmark packet-switching network established in 1969. ARPAnet was developed in the 197s0 by BBN and funded by ARPA.It eventually evolved into the Internet. The term ARPAnet was officially retired in 1990.There are two kinds of E-mail protocol used in the Internet. One is Simple Mail Transfer Protocol (SMTP) which accepts incoming connections and copies messagesfrom them into the appropriate mailboxes . Another is Post Office Protocol-3 (POP3) which fetches E-mail from the remote mailbox and stores it on the user ' s local machine to be read later.Telnet is used for remote terminal connection, enabling usersto log in to remote systems and use resources as if they were connected to a local system.5.2Mobile Web use-or wireless Web, as it is frequently referred to-is one of the fastest growing Web applications today. Notebook and handheld devicesfrequently use attached or built-in modems to access the Internet; most mobile phones and pagers have Internet connectivity built in.Another type of dial-up connection is ADSL which is the most common way to access the Internet today. Sometimes ADSL is called as broadband accessing, because it provides more wide bandwidth than that the regular modem provides.Unlike satellite and fixed wireless connections, which use a cable to connect the modem to some type of fixed transceiver, mobile wireless connections allow the device to be moved from place to place. Consequently, most handheld PCs and othermobile devices (like Web-enable cell phones) use a mobile wireless connection and access the Internet through the same wireless network as cell phones and messaging devices.CHAPTER 66.1Until now there has always been a clear division between public and private networks. A public network,like the public telephone system and the Internet, is a large collection of unrelated peers that exchange information more or less freely with each other. The people with access to the public network may or may not have anything in common, and any given person on that network may only communicate with a small fraction of his potential users.Using the Internet for remote accesssaves a lot of money. You'll be able to dial in wherever your Internet service provider (ISP) has a point-of-presence (POP). If you choose an ISP with nationwide POPs, there's a good chance your LAN will be a local phone call away. Some ISPs have expanded internationally as well, or have alliances with ISPs overseas. Even many of the smaller ISPs have toll-free numbers for their roaming users. At the time of this writing, unlimited access dial-up PPP accounts, suitable for business use, are around $25 per month per user.At any rate, well-chosen ISP accounts should be cheaper than settingup a modem pool for remote users and paying thelong-distance bill for roaming users.Eventoll-free access from an ISP is typically cheaper than having your own toll-free number, because ISPs purchase hours in bulk from the long-distance companies.Using our previous example of the customer databasei,t 's easy to seehow a VPN could expand the Intranet application's functionality. Suppose most of your salespeople are on the road, or work from home. There's no reason why they shouldn't be able to use the Internet to access the Web server thahtouses the customer database application. oYu don't want just anyone to be able to access the information, however, and you're also worried about the information itself flowing unencrypted over the Internet. A VPN can provide a secure link between the salesperson's laptop and the Intranet web server running the database, and encrypt the data going between them. VPNsgive you flexibility, and allow practically any corporate network service to be used securely across the Internet.6.2For some time now, large business enterprises have used electronic commerce to conduct their business-to-businesstransactions. Electronic data interchange (EDI) on private networks began in the 1960s, and banks have been using dedicated networkfsor electronic funds transfer (EFT) almost aslong. Recently, however, with the increased awareness and popularity of the Internet, electronic commerce has come to encompass individual consumers as well as businesses of all sizes.To many, electronic commerce is defined as the buying and selling of products and services over the Internet, but there are many more aspects. From its inception, electronic commerce had included the handling of purchase transactions andfunds transfers over computernetworks. Its gr'own now to include the buying and selling of new commodities such as electronic information. And the opportunities for companies seeking to take advantage of thecapabilities of electronic commerce are greater than merely adopting our present view of commerce to performing those same transactions over electronic networks.Electronic commerce is a system that includes not only those transactions that center on buying and selling goods and servicesto directly generate revenue, but alsothose transactions that support revenue generation, such asgenerating demandfor those goods and services, offeringsales support and customer service (see Fig.6-1), or facilitating communications between business partners.。