... 直线 straight line steep; sharp 射影直线 projective line; projective straight line 影直 kagenao ...
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complex projective straight line [数] 复射影直线
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Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
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。
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