birds of a feather flock together
物以类聚
口语·物以类聚
英文释义
people of similar interests, character, or backgrounds tend to stick together
例句
I'm not surprised they're friends; birds of a feather flock together.
典故来源
源自16世纪英国谚语，字面意为同类鸟聚集成群，比喻性格或兴趣相似的人容易聚在一起。