曾经沧海难为水
céng​jīng​cāng​hǎi​nán​wéi​shuǐ

seen it all

  1. 曾经 曾經 céng​jīng adverb
    once
    previously; in the past; indicates that an action has happened before, often used in combination with 过 guo
  2. 沧海 滄海 cāng​hǎi
    the sea
    the deep blue sea; the vast ocean
  3. 难为 難為 nán​wéi
    hard to do
    (bound form) Difficult to perform, manage, or achieve.
  4. 水 shuǐ noun
    water
    water; a liquid, juice, or lotion