... official'ssignals裁判员手势 twopoints两分 onepoints一分 ...
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Convex polygons are a usefulrepresentation, since we know that there are no obstructions between any twopoints inside a polygon.
凸多边形是一个很有用的表示法,因为我们知道凸多边形内部任意两点之间没有障碍。
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