「不可能」英文怎么说？when pigs fly
when pigs fly = 不可能（惯用语）
when pigs fly 是什么意思？
when pigs fly：不可能。出自主题「母语人士超爱用的惯用语」。
例句
- He'll clean his room when pigs fly.
- I'll do it when pigs fly. So, never.出自 英文测验 #41
▶ 免费测验「母语人士超爱用的惯用语」96 个字答错的字会先回来 · 答对赚金币
同主题还有
| a grain of salt | 半信半疑 |
| the last straw | 忍无可忍 |
| through thick and thin | 同甘共苦 |
| up in the air | 未定 |
| wrap my head around | 理解 |
| a blessing in disguise | 因祸得福 |
| a dime a dozen | 多得是 |
| actions speak louder | 行动胜于言语 |