这是因为从这两个环中的任何一个内部的任何点绘制的射线都穿过偶数数目的段。
This is because a ray drawn from any point within either of those two rings passes through an even number of segments.
这是因为从这两个环中的任何一个内部的任何点绘制的射线都穿过偶数数目的段。
This is because a ray drawn from any point within either of those two rings passes through an even number of segments.
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