When pigs fly.

當豬在飛時?

英解:something that will never happen

例句:

You will tidy up your room when pigs fly.(你會整理你的房間?這恐怕是天方夜譚吧!)

註:從字面上解釋,「當某事會發生時,豬都會飛了。」弦外之音就是「不可能發生!」◇

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