An apple a day keeps the doctor away日吃苹果一只，身体健康不求医。

The rotten apple injures its neighbours.一个坏朋友可以影响一群好人。(一只烂苹果弄坏一大筐Throw away the apple because of the core.因噎废食。为了果核丢果肉to be the apple of one's eye某人的掌上明珠(疼他仿佛苹果在眼中)