Based on the analyse of current 3d CAD design system, the basic conception of 4d information model is expounded.
在对当前三维CAD设计系统进行分析的基础上，阐述了4d信息模型的基本概念。
I had no 3d skills and no job because all the design firms were only hiring CAD jockeys at that time.
我不会3维技术，找不到工作，因为那时候所有的设计公司只要软件高人。
The key problems of panel die CAD is the design and analysis of 3D die surfaces.
覆盖件模具CAD的难点在于模具接触曲面的设计和分析。
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