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。

If any of these points are connected to each other, then we have found a triangle of three mutual friends.

youdao

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).

youdao