when pigs fly

• adv. 永无可能

when pigs fly的用法和样例：

例句

用作副词 (adv.)

1. When an Esoteric Buddhist has finished the four diligent exercises, he must vow not to breach samaya before Abhiseka, or he will never enter into the madala.
   在密法修行加行完毕准备接受灌顶之前，必须受三昧耶戒，否则入坛灌顶绝无可能。