...缀为.brd ；模块定义(Module Definition)文件，文件后缀为.mdd ；设计(Layout)文件，文件后缀为.mcm ；符号绘制(Symbol drawing)文件，文件后缀为.dra 。
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几何公式符号绘制 Geometry Expressions
绘制符号表达式的图形 ezplot
端口连接符号的绘制 Place Off-Page Connector
绘制符号 drawn symbol
数据的绘制主要分为矢量符号绘制和曲线绘制。
The drawing of data is mainly composed of the vector sign drawing and the curve drawing.
图3：没有用定义明确的建模符号绘制的非正式的系统会很快松散起来。
Figure 3: an informal system drawing without well-defined modeling notation can quickly become incoherent.
矢量符号是通过查询数据库，调用已完成的矢量符号绘制的。
The vector sign is drew by inquiring the database and invoking the vector sign that has been accomplished.
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