垂线段
垂线段-
异面直线公垂线段中点算法为基的三维点重建垂线间垂线间垂线间的
3D points reconstruction based on the midpoint of skew lines common perpendicular algorithm
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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 .