渤澥桑田

bó xiè sāng tián

lit. blue seas where once was mulberry fields (idiom, from 史記|史记[Shi3 ji4], Record of the Grand Historian); time brings great changes

life's vicissitudes

渤

bó

same as 渤海[Bo2 Hai3], Bohai Sea between Liaoning and Shandong

澥

xiè

(of porridge etc) to become watery

桑

sāng

(bound form) mulberry tree

田

tián

field