A Useful Way

Father: Jack, why do you drink so much water?   Jack: I have just had an apple, Dad.   Father: What's that got to do with it?   Jack: I forgot to wash the apple.   爸爸：杰克，你干嘛喝这么多水呀？   杰克：我刚才吃了个苹果，爸爸。   爸爸：可是这跟喝水有什么关系呢？   杰克：我忘了洗苹果呀。   http://meiwen.anslib.com/