Senses
曾经沧海难为水/ 曾經滄海難為水 seen it all
Having seen the vast ocean, other water seems insignificant; used to describe a person so experienced or well-traveled that ordinary things seem unremarkable. From a Tang dynasty poem by 元稹
曾经沧海难为水/ 曾經滄海難為水 unable to love again
Having experienced a perfect love, one cannot or will not settle for anyone else. From a Tang dynasty poem by 元稹