... double-pulsed time 双脉冲间隔 drafting scale 制图尺，绘图尺 driving (1)传动，驱动(2)激厉(3)主动的 ...
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... drafting board 制图板，绘图板 drafting scale 制图尺，绘图尺 drag 曳力，阻力 ...
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drafting g scale 绘图比例尺
scale drafting 比例制图
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According to the nature of projective scale, it has solved the problem of drawing a cars perspective when perspective vanishing point is out of the drafting board.
文中利用射影几何中射线比的特殊性质，解决了透视灭点在图板外的透视图画法。
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