一条直线同时垂直于两条或两条以上线段或直线，这条直线就是被垂直的线段或直线的公垂线。然而，如同两条异面直线的公垂线夹在异面直线间的部分，这才被叫做公垂线段。
那我一定穿越时空的阻隔，划条公垂线向你冲来，一刻也不愿逗留。
Then I must through the barriers of time, draw a male vertical to you came on at a moment, also not the wish to linger.
两条异面直线的距离也不必要找出公垂线段，只需利用向量的射影性质来解即可。
Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
该方法利用空间两异面光 轴公垂线估计交会点位置，克服了常规算法中的模型误差。
The method estimates intersecting point by means of optical axis public vertical line of two different planes in space.
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