ㄐㄧㄥˇjǐngㄕㄨㄟˇshuǐㄅㄨˋㄈㄢˋfànㄏㄜˊㄕㄨㄟˇshuǐ

  1. 井水不相干比喻界限分明不干紅樓夢·》:井水不犯河水怎麼?」官場現形·一回》:井水不犯河水為甚麼?」河水不犯井水」。

everyone minds their own business