如果这些点相互连接，我们得到一个三角形，有三对人互为朋友。(四个点中的两个点相连，加上它们又都与最初的一个点相连)。

If any of these points are connected to each other, then we have found a triangle of three mutual friends. (these two points are connected, plus they are both connected to the original point).

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这座城的四个角都还布有一些结构精巧、外观秀丽的角楼。

The city of four angles are also have some structure compact, appearance beautiful turrets.

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它检查是否有任何球的四个角有相交的任何有形砖。

It checks whether or not any of of the ball corners has intersected any of the visible bricks.

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