中文说明：判断同一平面内两线段是否相交，端点在线上，或者相离
English Description：
Determine whether the two line segments in the same plane intersect, the endpoints are on the line, or are separated
Judge whether two line segments intersect in the same plane
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中文说明：判断同一平面内两线段是否相交，端点在线上，或者相离
English Description：
Determine whether the two line segments in the same plane intersect, the endpoints are on the line, or are separated判断线段相交.txt