曾经沧海难为水，除却巫山不是云
there are no rivers to one who has crossed the ocean, and no clouds to one who has passed Mount Wu (idiom)
Traditional: 曾經滄海難為水，除卻巫山不是雲
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📖 Additional Information
English Phonetic:
'idiәm
Detailed Definition:
n. an expression whose meanings cannot be inferred from the meanings of the words that make it up