CADD (Computer Aided Design and Drafting) has become a very familiar phrase in our everyday language.

计算机辅助设计绘图(CADD)已日益为人们所熟悉。

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Now, many digital logic systems cannot do without computer aided design CAD, especially the VHDL Hardware Description Language.

数字逻辑系统的设计离不开计算机辅助设计CAD工具的帮助，尤其是VHDL硬件描述语言。

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