8.1 Computer-aided Design and Computer-aided Manufacturing
?The graphic image can be presented in a two-
dimensional (2-D), three-dimensional (3-D) , or solid format. ICG images are constructed using such basic geometric characters as points, lines, circles, and curves. Once created, these images can be easily
edited and manipulated in a variety of ways including enlargements, reductions, rotations, and movements.
?图像以二维(2D)、三维(3D)或实体形式呈现，ICG图
像由点、线、圆、曲线等基本几何特征组成。一旦图像建立，它们可以很容易的被编辑，并且可以
（对其）进行放大、缩小、旋转、运动等各种操作。
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An ICG system has three main components: 1） hardware, which consists of the computer and various peripheral devices; 2) software, which consists of the computer programs and technical manuals for the system ( the popular ICG software used in CAD/CAM at present includes AutoCAD, CADKEY, Pro/E, UG, I-DEAS and CATIA etc.); 3) the human designer, the most important of the three components.
?
8.1 Computer-aided Design and Computer-aided Manufacturing
ICG系统有3个主要组成部分： 1）硬件，它由计算机一级各种外围设备组成。 2)软件，它由计算机程序及系统（使用的）技术手册组成（流行的ICG软件有AutoCAD, CADKEY, Pro/E, UG, I-DEAS 和CATIA 等）； 3)设计者，是三个组成部分中最重要的。 - 11 -
8.1 Computer-aided Design and Computer-aided Manufacturing
?A typical hardware configuration for an ICG system
includes a computer, a display terminal, a disk drive unit for floppy diskettes, a hard disk, or both; and input/output devices, such as a keyboard, plotter, and printer. These devices, along with the software, are the tools modern designers use to develop and document their designs.
?ICG系统中典型硬件配置包括计算机、显示器终端以及软盘的磁盘驱动器、硬盘、输入/输出设备诸如键盘、绘图机、打印机。这些设备和软件都是现代设计者开发和保存其设计文档的工具。
?configuration [k?n,fiɡju'rei??n] n. 配置；结构；外形 - 12 -
8.1 Computer-aided Design and Computer-aided Manufacturing
?The ICG systems could enhance the design process
by allowing the human designer to focus on the intellectual aspects of the design process, such as conceptualization and making judgment-based decisions.
?通过允许设计者将精力集中在设计过程的智力方面，
例如：概念化、基于判断做决定等，ICC系统能够提高设计过程的速度。
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8.1 Computer-aided Design and Computer-aided Manufacturing
?The computer performs tasks for which it is better
suited, such as mathematical calculations, storage and retrieval of data, and various repetitive operations such as crosshatching.
?计算机比较适合的任务是数学计算、数据的存储与
恢复，以及画交叉阴影线等重复操作。
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