At present most of commercial CAD systems lack manufacture information of components. and many experiments about feature description of components exist more limitation.

目前大多数商用CAD系统缺乏零件的制造信息，而且许多实验系统所进行的零件特征描述亦存在较大局限性。

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There exist many design techniques for ASICs, which are based on advanced design tools and extensive bases for IC CAD.

专用集成电路的设计目前有很多方法，但都基于有先进的设计工具和较为丰富的集成电路CAD库。

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There are professional propeller CAD/CAM software overseas, but these software are expensive, many factories can not pay them.

国外有专用螺旋桨CAD/CAM软件，但是，这些软件价格及其昂贵，令大多数厂家难以承受。

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Many new CAD programs are also being bundled with product-management programs that allow for on-the-fly updating of a bill of materials.

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