☉ 沧海桑田 【cānɡhǎisānɡtián】
　　[ 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。
　　例： 山河改转，沧海桑田