This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of plane trace and geometrical drawing method.

探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。

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You cannot optimize pictures that have a drawing type of format vector graphics vector graphics: The representation of graphic objects such as lines, arcs, and squares by using geometrical formulas.

不能优化具有绘图类型格式矢量图形向量图形：使用几何公式的图形对象的表示形式，如线条、弧形和正方形。

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He was drawing in this circle geometrical lines, and seemed as much absorbed in his problem as Archimedes was when the soldier of Marcellus slew him.

他正在圆圈里划几何线，那神态就象阿基米德当马赛鲁斯的兵来杀他时的那样全神贯注。

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