早先项目组决定仅仅只使用开源软件，但是”计算机辅助设计软件工具仍然是开源领域的最大弱势所在“梅尔兹说道。

A decision was made early on to use only open-source software, but "computer-assisted design (CAD) tools are still the biggest weakness in open-source, " says Merz.

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Tcl在计算机辅助设计(CAD)领域中特别流行，象Cisco和Nortel这样的联网设备供应商也都使用它。

Tcl in particular has been popular in the computer-assisted design (CAD) segment, and with such networking equipment vendors as Cisco and Nortel.

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没有自动旋转底盘的图像，没有视觉工程设计，没有用于建筑、厨房、高速公路等的CAD(计算机辅助设计)。

No more pictures of a rotating auto chassis, no visual engineering design, no CAD (computer- aided design) for buildings, kitchens, highways, etc.

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