Perhaps Not 为什么没有牡蛎

 Customer: Waiter, I can't find any oysters in this oyster stew.

Waiter: Well, you wouldn't expect to find any angels in an angel food cake, would you?

顾客：服务员，我这个牡蛎炖菜里怎么没有牡蛎？

服务员：是啊，你不会指望在天使蛋糕里发现天使吧？