白云蒼狗 báiyún-cānggǒu

[white clouds change into grey dogs,vicissitudes] 比喻變化快,世事變幻無常。典出杜甫《可嘆》詩:“天上浮云似白衣,斯須改變如蒼狗。”,也作“白衣蒼狗”。蒼:灰色。

近義詞：

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,滄海桑田