英语博客-北美风情 64、Expression: When pigs fly
时间：2019-01-01 作者：英语课 分类：英语博客-北美风情
英语课
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The expression when pigs fly is used when people talk about something they would never do, or some event that would never happen. It is a very old expression, and no one knows why we talk about pigs! We can also use the similar expression, when hell freezes over. Check out the examples in this episode.