渤澥桑田

Explanation: Bo bay: the ancient name of the Bohai Sea. The sea into a mulberry, mulberry into the sea. Things change a great metaphor 　　Usage: Contraction type; as object; change things a great analogy 　　Source: Song Su "He sent with the king to send Joe" The second verse: "Do not panic Bo creek Kuwata change, see Meng Lou Zhe turtle spring." Thesaurus:  Change Coast Valley, white clouds change into grey dogs,vicissitudes, Cang white dog, Ebb and flow Ling Gu, Cang dog commoner without rank, Dust the East China Sea