Now, many digital logic systems cannot do without computer aided design CAD, especially the VHDL Hardware DescriptionLanguage.
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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More researches into the inheritance system facilitates searching information more effectively, enriching computerlanguage and enlarging knowledge description of artificial intelligence.
对继承系统的深入研究，便于进行有效搜索，丰富计算机语言及人工智能的知识描述。
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Postscript: A page descriptionlanguage developed by, Adobe Systems Inc. of America. It is a computer programming language which tells a corresponding output device how to print the page.