猪会飞吗？你见过会飞的猪吗？英语中有个俚语叫做 Pigs might fly，字面意思就是猪可能会飞。但是，猪压根儿不会飞，那为什么说猪可能会飞呢？

　　Pigs don't fly. So we say "pigs might fly" when there is no chance of something happening at all(British, American & Australian, informal, American, informal). 当我们想表达一件不可能发生的事情时，就可以用 pigs might fly 这个成语。

　　据辞源介绍，俚语Pigs might fly或There's a pig flying by 源于苏格兰谚语"Pigs fly in the air with their tails forward"(字面意：猪在空中倒着飞；比喻意：绝对不可能发生之事)。谚语认为：即使发生奇迹，猪飞了起来，但若让猪倒着飞，那肯定百分之百实现不了。

　　例句：

　　A: I bought a lottery ticket yesterday.

　　B: Just think, you could buy a new sports car.

　　A: And I'd buy a house in Hawaii... and pigs might fly!

　　A: Look... Brad Pitt…he is just gorgeous.

　　B: Why can't a man like that ask us on a date?

　　A: Yeah pigs might fly!

　　哈哈，两个人在幻想彩票中奖后的美事，虽然她们自己都觉得这些是不可能发生的事情。

　　又如，you're running a marathon for the first time and you're not a very confident runner. A friend says to you--how long do you think it will take? Four hours? You would say--and pigs might fly because you know there is no chance of that happening. 如果不擅长长跑的你参加马拉松赛跑，一个朋友说你在四个小时内可以跑完，这时你就可以说 pigs might fly，因为你自己知道这绝对不可能！

　　其实中文里也有一个相似的表达，那就是太阳从西边出来了！因为太阳永远不会从西边出来！下次若朋友提出什么荒诞建议，你就可以说“除非太阳从西边出来”，或者大手一挥朝向窗户，随声惊呼"Look!There's a pig flying by"！