英语翻译Computer-Aided Design is one of the many tools used by e

英语翻译
Computer-Aided Design is one of the many tools used by engineers and designers and is used in many ways depending on the profession of the user and the type of software in question.There are several different types of CAD.Each of these different types of CAD systems require the operator to think differently about how he or she will use them and he or she must design their virtual components in a different manner for each.There are many producers of the lower-end 2D systems,including a number of free and open source programs.These provide an approach to the drawing process without all the fuss over scale and placement on the drawing sheet that accompanied hand drafting,since these can be adjusted as required during the creation of the final draft.
3D wireframe is basically an extension of 2D drafting.Each line has to be manually inserted into the drawing.The final product has no mass properties associated with it and cannot have features directly added to it,such as holes.The operator approaches these in a similar fashion to the 2D systems,although many 3D systems allow using the wireframe model to make the final engineering drawing views.
3D "dumb" solids (programs incorporating this technology include AutoCAD and Cadkey 19) are created in a way analogous to manipulations of real world objects.Basic three-dimensional geometric forms (prisms,cylinders,spheres,and so on) have solid volumes added or subtracted from them,as if assembling or cutting real-world objects.Two-dimensional projected views can easily be generated from the models.Basic 3D solids don't usually include tools to easily allow motion of components,set limits to their motion,or identify interference between components.

计算机辅助设计是许多工具使用的工程师和设计师和使用在许多方面取决于行业的用户和类型的软件的问题.有几种不同类型的CAD .所有这些不同类型的CAD系统要求经营者不同的想法如何,他或她将利用它们和他或她必须设计自己的虚拟组件以不同的方式为each.There有许多生产者低端二维系统,其中包括一些自由和开放源码程序.这些提供了一个办法,制定进程的所有大惊小怪了规模和安置的绘图表伴随手起草,因为这些可以调整过程中的要求建立的最后草案.
三维线框基本上是一个扩展的二维起草.每一行都必须手动插入绘图.最终产品没有质量性能与它相关的,不能有功能直接添加到它,如孔.这些经营者的做法以类似的方式在二维系统,虽然许多三维系统允许使用线框模型,以作出最后的工程制图的意见.
三维“哑巴”固体（计划将这项技术包括AutoCAD和Cadkey 19 ）创建的方式类似于操纵真实世界物体.基本三维几何形式（棱镜,柱面,领域等） ,有坚实的数量增加或减去他们,如果装配或切割真实世界的物体.双向预测的意见,可以很容易地产生的模式.基本三维固体通常不包括工具,很容易让运动的组成部分,规定了限制他们的动议,或确定组成部分之间的干扰.