In this paper, a core program package related for drawing pictures in micro computers with Oriented Geometry is presented to describe profile of machine parts in numerical control.
本文以有向几何为背景陈述一个微机绘图核心程序包，用它描写数控加工零件的平面外型轮廓，并在微机上绘制各种复杂的平面图形。
A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts.
句中不应有赘余之词，段落中不应有赘余之句，就像画作中不应有蛇足之线条，抑或机器不应有多余之零件。
Build up machine spare parts list and drawing.
编制设备备件图册。
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