when pigs fly片語KK [wɛn pɪgz flaɪ] /wɛn pɪɡz flaɪ/發音片語1絕不可能、永無可能、除非太陽從西邊出來口語He'll clean his room when pigs fly.他會整理房間?除非太陽從西邊出來。2做夢、休想口語They'll pay us back when pigs fly, I'm afraid.恐怕他們要還我們錢是做夢了。