人們往往因為興趣、愛好、性格相互融洽而成為朋友，有的是志同道合，有的是臭味相投。

“物以類聚，人以群分”，中文俗語，比喻同類的東西常聚在一起，合得來的人相聚成群，是朋友之間志同道合的統(tǒng)稱，可分開使用。與英文習語“birds of a feather flock together”意思相近，表示“People who have similar interests, ideas, or characteristics tend to seek out or associate with one another”。

例句：

喬治：你為什么認為唐納德靠不??？
George: Why do you think Donald is dishonest?

內德：他的朋友都靠不住。物以類聚，人以群分。
Ned: All his friends are dishonest. Birds of a feather flock together.

我一直認為艾米很狂，而現(xiàn)在她和那個勢利的男孩路易斯在約會。真是物以類聚。
I always thought Amy was pretentious, and now she's going out with that snobbish boy, Louis. Birds of a feather flock together.

Editor: Jade