渤澥桑田

bóxièsāngtián ㄅㄛˊ ㄒㄧㄝˋ ㄙㄤㄊㄧㄢˊ

- lit. blue seas where once was mulberry fields (idiom, from 史记 shǐjì, Record of the Grand Historian) time brings great changes
- life's vicissitudes

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