文字是语言最重要的辅助工具，是人们日常生活中须臾不可或缺的符号系统。

The writing system is not only the most important auxiliary instrument of a language, but the indispensable system of signs used in daily life.

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EER模型到数据库模式的转换是数据库逻辑设计辅助工具系统DBLD的主要任务之一。

The transformation of the EER model to database schema is one of the main tasks of the aided database design tool DBLD.

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VHDL硅编译器是XUECAD集成电路自动设计系统的一个辅助工具。本文将着重介绍改进后的VHDL硅编译器的布局、布线算法。

VHDL silicon compiler is a supplementary tool of the IC CAD system-XUECAD. The algorithms of modified VHDL silicon compilers placing and routing are introduced in this paper.

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