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井水不犯河水
jǐng shuǐ bù fàn hé shuǐ
  1. 1 everyone minds their own business
河水不犯井水
hé shuǐ bù fàn jǐng shuǐ
  1. 1 lit. river water does not interfere with well water (idiom); Do not interfere with one another.
  2. 2 Mind your own business.