鱼水

yúshuǐ

鱼水 — yúshuǐ

1. fish and water (metaphor for an intimate relationship or inseparability)

   他们像鱼水一样，形影不离。 tāmen xiàng yúshuǐ yīyàng xíngyǐngbùlí — They are like fish and water, inseparable.