Boy, why have you got cotton-wool in your ear? Is it infected?

　　孩子，你为什么用棉花塞住耳朵?它感染了吗?

　　No, sir, but you said yesterday that everything you told me went in one ear and out the other , so I am trying to stop it.

　　没有，老师。可是你昨天说你告诉我的知识都是一个耳朵里进，一个耳朵里出，所以我要把它堵在里面。