白云苍狗 biyn-cānggǒu

[white clouds change into grey dogs,vicissitudes] 比喻变化快,世事变幻无常。典出杜甫《可叹》诗:天上浮云似白衣,斯须改变如苍狗。,也作白衣苍狗。苍:灰色。

近义词：

沧海桑田 cānghǎi-sāngtin

[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