ㄏㄜˊㄕㄨㄟˇshuǐㄅㄨˋㄈㄢˋfànㄐㄧㄥˇjǐngㄕㄨㄟˇshuǐ

  1. 井水不相干比喻界限分明不干咱們彼此河水不犯井水!」井水不犯河水」。

lit. river water does not interfere with well water (idiom)​; Do not interfere with one another., Mind your own business.