白云苍狗

Explanation: Cang: gray. Clouds like white clothes, the instant they become like dark green dog. Analogy volatile things. 　　Usage: The main predicate; as the predicate attribute; metaphor changing things with no fixed, not easy to guess 　　Source: Tandoori Fu "deplorable" poem: "the sky like white clouds, Sri Lanka, such as dark green dog is subject to change." 　　Examples: What things ~, Department of the carry on with feeling! (Lu Xun "canopy _set_ postscript") Thesaurus:  Change Coast Valley, Cang white dog, Bo bay Kuwata, Ebb and flow Ling Gu, Cang dog commoner without rank, Dust the East China Sea