New Channel
reliability [ri,lai?'bil?ti] n. 可靠性 可靠性 可靠度 信度 reliable [ri'lai?bl] n. 可靠的人 adj. 可靠的；可信赖的
? Section IV Technical Terms
Servo system Servo motor Servo drive Open loop system Closed loop system Semi-closed loop system
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Unit 9 Use of CAD
? Section I Dialogue
Welcome to our CAD lab. Now we are having drawing class. 欢迎你到我们的CAD实验室，现在我们正有绘图班。
Can your students draw the geometry of a work-piece on a computer? 你的学生能在计算机上画工件的几何形状吗？
Yes, let’s see how to make a part drawing with CAD software. 是的, 让我们来看看如何用CAD软件绘制零件图。
Excellent! The students create the design model by applying graphics commands stored on the computer.
太棒了！学生通过应用存储在计算机上的图形命令创造设计模型。
Look, the students have complete freedom to zoom and view the model at different orientations and then represent the design as a set of points, lines, arcs, and so on by using basic CAD software. Actually, graphics editing commands allow for easy modifications as required.
看，学生们可以随意缩放和查看模型不同的方向，使用基本的CAD软件设计点、线、弧等。 实际上，图形编辑命令允许根据需要方便的修改。
I am impressed by your students’ skills and your teaching. 学生的技能和你的教学，给我留下了深刻的印象。
I hope we can visit your school and communicate with your staff before long. 我希望过不了多久，能够访问你的学校，并与您的员工进行沟通。 No problem.
Thank you very much for your time. You are welcome.
? Section II Reading
Use of CAD CAD的使用
CAD is a technique of using a computer to create, modify, and refine a design. CAD是一种使用计算机技术来创建（生成），修改和完善（精化）设计的技术。 It, normally used in engineering departments, has greatly changed these departments. 它通常在工程部门使用，极大地改变了这些部门。
Drawings used to be made on paper with pencil or pen and drawing instruments. 制图过去常用铅笔或钢笔以及绘图仪器在纸上完成。 The drawings were very time-intensive to produce. 制作图纸是非常耗费时间。
They were then copied, and the copies were sent to the floor for production. 然后，它们被复制、副本被发送到生产车间。 The originals were stored in large drawers. 原件都储存在大抽屉里。
Even a small job shop could have thousands of large blueprints on file. 即使是很小的加工车间可能有成千上万的大图纸文件。
If changes were necessary, the engineer would get the original out of the file drawer, make the changers, copy it, and send the new print to the floor.
如果需要修改，工程师拿到抽屉里的原始文档进行修改、复制，并发送新的图纸到车间。
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Nowadays the computer can eliminate the need for all the physical storage of prints. 如今，计算机可以消除所有物理存储图纸的需要。 The computer also allows for rapid and easy modifications. 计算机也允许快速和容易的修改（图纸）。
The engineer or designer first draws the part on the screen. 工程师或设计师首先在屏幕上绘制零件。 This part drawing is the actual part geometry. 零件图实际上是它的几何形状。
The sizes and locations are all correct so that the information can be used later to create a program to machine the part.
这些尺寸和位置都是准确的，这样这些信息随后可以被用来编制加工该零件的程序。
? Section III Words and Expressions
excellent ['eks?l?nt] adj. 卓越的；极好的；杰出的 graphics ['ɡr?fiks] n. [测] 制图学；制图法；图表算法
orientation [,?:rien'tei??n, ?u-] n. 方向；定向；适应；情况介绍；向东方 oriental [,?:ri'ent?l, ,?u-] n. 东方人
represent [,repri'zent] vt. 代表；表现；描绘；回忆；再赠送 vi. 代表；提出异议 modification [,m?difi'kei??n] n. 修改，修正；改变 modify ['m?difai] vt. 修改，修饰；更改 refine [ri'fain] vt. 精炼，提纯；改善；使文雅
intensive [in'tensiv] adj. 加强的；集中的；透彻的；加强语气的 time-intensive 密集的 耗时的
original [?'rid??n?l]adj. 原始的；最初的；独创的；新颖的n. 原件；原作；原物；原型 blueprint ['blu:prints] n. 蓝图；模板v. 绘的蓝图 eliminate [i'limineit] vt. 消除；排除
modification [,m?difi'kei??n] n. 修改，修正；改变 geometry [d?i'?mitri] n. 几何学
? Section IV Technical Terms
Graphics editing commend 图形编辑指令 Drawing instrument 绘图仪器 Part drawing 零件图
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Unit 10 AutoCAD
? Section I Dialogue
Would you please tell me how to create a new drawing with AutoCAD? 请告诉我如何用AutoCAD创建一个新的绘图吗? No problem. Open your AutoCAD window. 没有问题。打开你的AutoCAD的窗口。 Here it opens. 打开了。
Firstly, choose New from the File menu. 首先，从“文件”菜单中选择“新建”。 Yes, here comes the dialogue box. 是的，弹出了对话框。
Secondly, choose Start from Scratch. 其次，从 “草图”中选择“开始”。。 How about the next step? 下一步该怎么办?
Take it easy. Under Select Default Setting select English or Metric, and then choose OK. 别紧张。 在选择默认设置选择英制或公制，然后选择确定。 The drawing opens with the default AutoCAD settings. 打开绘图AutoCAD的默认设置。
You’re really a quick learner. Finally choose Save As from the File menu and enter a file name. Then you can save the drawing.
你真聪明。最后选择从文件菜单中的“另存为”，并输入一个文件名，然后你可以保存绘图。
? Section II Reading
AutoCAD Interface AutoCAD的界面
AutoCAD is a Computer Aided Design (CAD) program used by just about every engineering and design office in the world. When you start AutoCAD, the AutoCAD window will open. The window is actually your design work space.
AutoCAD是一个计算机辅助设计程序，用于世界上几乎所有的工程和设计办公室。当你启动AutoCAD，AutoCAD的窗口将打开。窗户实际上是你的设计工作空间。
The AutoCAD interface has several different components, each of which provide different information of command options for the user. This diagram labels the most vital parts of the interface.
组成AutoCAD界面的组成不同，但每个组成都可以为用户提供不同的指令选择信息。下图列出了最重要的组成部分。
? Section III Words and Expressions
metric ['metrik] n. 度量标准 adj. 公制的；米制的；公尺的 diagram ['dai?gr?m] n. 图表；图解 vt. 用图解法表示 label ['leibl] v. 贴标签于； n. 标签；分类
vital ['vait?l] adj. 至关重要的；生死攸关的；有活力的 interface ['int?feis] n. 界面；接口；接触面 redraw [,ri:'dr?:] vt. 重画
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undo [,?n'du:] vt. 取消；解开；破坏；扰乱 vi. 撤消 property ['pr?p?ti] n. 性质，性能；财产；所有权 linetype n. 线型
lineweight n. 线宽 线型宽度 线宽线宽
access ['?kses, '?ks?s, ?k'ses] n. 进入；使用权；通路 vt. 使用；存取；接近 crosshairs ['kr?sh??z] n. 十字准线；瞄准器
cursor ['k?:s?] n. 光标；指针（计算尺的）[计] 游标，指针 icon ['aik?n] n. 图标；偶像；肖像，画像；圣像 tab [t?b] n. 标签；制表；帐单 vt. 给贴标签 layout ['leiaut] n. 布局；设计；安排；陈列
layers ['lei?s] n. 图层面板，图层集合（layer复数形式）；层面板
? Section IV Technical Terms
Dialogue box 对话框 Default setting 默认设置 Menu bar 菜单栏 Toolbar 工具栏 Drawing area 绘图区 Coordinate system 坐标系 Model tab 模型空间 Layout tab 布局空间 Status bar 状态栏
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