there was a customer who came and asked a waiter in a cafeteria: "oh, tell me, susan, how do you keep all the flies out of your coffee shop?"

有位客人问餐厅的服务生：苏珊，你们店里都没有苍蝇，你是怎么做到的？

so she said: "i just let the flies taste the stuff."

苏珊回答说：我只是让苍蝇先试吃我们的东西。