A Useful WayFather: 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。