In one study they looked at a housing project in Manhattan and they asked people where their best friend was and 90% of them said, "My best friend is in the same building as me," and 50% of them says the same floor.

在一个针对一栋曼哈顿住宅的研究中,他们问住户他们最好的朋友住在哪,90%的人说，“我最好的朋友和我住同一栋楼”,50%说住在同一层楼。

耶鲁公开课 - 心理学导论课程节选

Yes, I would say, make friends with everybody you meet.

是的，我想说，和你遇到的每个人成为朋友吧。

在超市遇到的人 - SpeakingMax英语口语达人