ㄅㄞˊㄘㄤㄍㄡˇbáiyī‑cānggǒu

白衣苍狗
  1. 可嘆〉:浮雲改變。」意思浮雲忽而忽而比喻世事變幻無常 景物依舊人事不禁白衣蒼狗」。

lit. (cloud shapes)​ changing from a white shirt to a gray dog (idiom)​, fig. the impermanence of all things