[沧海桑田 / 滄海桑田, cāng hǎi sāng tiánㄘㄤ ㄏㄞˇ ㄙㄤ ㄊㄧㄢˊ] lit. blue seas where once was mulberry fields (成语 saw); time brings great changes; life's vicissitudes#42797
[曾经沧海 / 曾經滄海, céng jīng cāng hǎiㄘㄥˊ ㄐㄧㄥ ㄘㄤ ㄏㄞˇ] lit. once experienced the vast ocean(成语 saw); fig. widely experienced in the vicissitudes of life; cf. to have known the world#48688