沧海桑田

Explanation: Kuwata: farmland. The sea into a mulberry, mulberry fields into the sea. Metaphor things a great deal. 　　Usage: Joint type; as predicate, object, clause; describe things changed dramatically 　　Source: Jin Ge Hong's "Supernatural Biography Magu": "Magu from that cloud, since reception, see the East China Sea have been three for Kuwata." 　　Examples: Fossils are ~ witness. Thesaurus:  Reply to earthshaking, Jiedixiantian, Ling Gu ebb and flow