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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Then, we first use the impulsive control approach to control the scaling factor of projective synchronization onto any desired scale.

然后，应用脉冲微分方程理论里的比较系统方法，首次用来研究部分线性系统的投影同步问题。

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