滄海桑田（滄海桑田）　

◎ 滄海桑田 cānghǎi-sāngtián

[the swift changes of the world;great changes are seen in the course of time;the evanescence of the worldly affairs is like the sea turned into a mulberry field (orchid)] 大海變成了種桑樹的田地,種桑樹的田地變成了大海。比喻世事多變,人生無常;或喻世事變化的巨大迅速——略稱滄桑

山河改轉(zhuǎn),滄海桑田