沧海桑田

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)] 大海变成了种桑树的田地, 种桑树的田地变成了大海。 比喻世事多变, 人生无常; 或喻世事变化的巨大迅速--略称沧桑

山河改转, 沧海桑田