可能考的
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汇编语言精确地控制着计算机的操作，但是，为一种计算机写的汇编语言在另一种计算机上运行时必须重写。
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High-level languages often use English-like words-for example,LIST,PRINT,OPEN,and so on-as commands that might stand for a sequence of tens or hundreds of ma-chine-language instructions.
高级语言常常将英语的词汇用作命令，例如LIST、PRINT、OPEN等等，这些命令可以代表数十或者数百条机器语言指令。
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Although C is considered by many to be more a machine-independent assembly language than a high-level language,its close association with the UNIX operating system.
尽管许多人认为C语言是比其他高级语言更与机器无关的编译型语言，但它与UNIX操作系统的联系很密切。
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Computer systems are undergoing a revolution. From 1945,when the modem computer era began, until about 1985, computers were large and expensive. Even minicomputers normally cost tens of thousands of dollars each.
计算机系统正经历着一场革命，从1945年的调制解调式计算机时代开始，到大约1985年为止，那时的计算机又笨又昂贵。即使是一台微型计算机通常也需花上几万美元。
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Starting in the mid-1980s, however, two advances in technology began to change that situa-tion. The first was the development of powerful microprocessors. The second development was the invention of high-speed computer network.
然而，始于80年代中期的两项技术进步，开始改变了这种局面。第一项技术进步是功能强大的微处理器的出现。第二项成就是高速计算机网络的诞生。
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The amount of improvement that has occurred in computer technology in the past half cen-tury is truly staggering and totally unprecedented in other industries.
在过去的半个世纪里，计算机技术领域所取得的成就是极其惊人的，与其他领域相比也是空前的。
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They are usually called distributed systems, in contrast to the previous centralized systems(or single-processor systems)consisting of a single CPU, its memory,peripherals, and some terminals.
与过去由单片CPU、存储器、外围设备和一些终端设备组成的集中式系统（或称单处理器系统）相比，这种系统通常称为分布式计算及系统。
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There is only one fly in the ointment: software. Distributed systems need radically different software than centralized systems do. In particular, the necessary operating systems are only beginning to emerge.
这种系统唯一美中不足的是软件问题，它运行时所需要的软件与集中式计算机系统的完全不同。尤其是运行分布式系统所必须的操作系统才刚开始出现。
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Shared data are absolutely essential to this and many other applications, so the machines must be interconnected. Interconnecting the machines leads to a distributed system.
共享数据对这种以及其他的应用场合是绝对重要的，因此各个计算机间应当相互连接起来，而这就组成了分布式计算及系统。
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A recent development with far ranging implications for CAI is the vast expansion of the Internet, a consortium of interlinked computers. By connecting millions of computers worldwide, these networks enable students to access huge stores of information, which greatly enhances their research capabilities.
对CAI具有深远意义的推动是Internet的巨大发展，Internet通过把遍及世界的数百万台计算机联接起来，使学生能获得大量的信息，可以大大提高他们的科研能力。
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Computer-Aided Design/Computer-Aided Manufacture(CAD/CAM), is the use of computers in the design and manufacture of materials. In the design stage, the techniques of drafting and computer graphics are combined to produce models of the object or object.
计算机辅助设计和计算机辅助制造就是在工艺的设计和产品的制造过程中使用计算机。在设计阶段，把草图的设计技术和计算机图形技术结合起来生成一个或多个物体的模型。
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Virtual reality simulations differ from other computer simulations in that they require special interface devices that transmit the sights, sounds, and sensations of the simulated world to the user.
虚拟现实模拟有别于其它的计算机模拟，他们要求专门的界面设备来向用户传送图像、声音和对模拟世界的感觉。
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Virtual reality programs give users three essential capabilities —immersion, navigation, and manipulation, People must be immersed in the alternate reality, not merely feel as if they are viewing it on a screen.
虚拟现实程序给用户三个基本能力——投入、漫游和操纵。人们必须完全投入到这另一个现实中去，而不能觉得仅仅是在看屏幕。
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Virtual reality programs also create a world that is completely consistent internally. Thus one can navigate one's way through that world as "realistically" as in the real world.
虚拟现实程序也创造一个内部完全协调的世界。这样，一个人就能像在现实世界中那样真实地在模拟世界的路上漫游。
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Artificial Intelligence(AI) is a term that in its broadest sense would indicate the ability of an artifact to perform the same kinds of functions that characterize human thought. The possibility of developing some such artifact has intrigued human beings since ancient times.
人工智能（AI）这个术语，从广义上讲，指的是人工制品完成具有人类思维特征功能的能力。自古以来，发明这样的人工制品的可能性一直在吸引着人类。
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With the growth of modern science, the search for AI has taken two major directions: psychological and physiological research into the nature of human thought, and the technological development of increasingly sophisticated computing systems.
随着现代科学的发展，对AI的探索主要在两个方向上进行着：对人类思维特征的心理和物理研究以及日趋先进的计算机系统的技术开发。
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专家系统，基于规则库推断技术，已将计算机带出了直接编程时代，用预先建立的规则系统来处理信息。
作文：
A computer is an electronic device that can receive a set of instructions, or program, and then carry out this program by performing calculations on numerical data or by compiling and correlating other forms of information.