例：My brother drives a Ford truck and wears blue jeans every day; he is as American as apple pie.
2、an apple a day keeps the doctor away: 苹果富含营养，要保持健康（不用看医生），就应该每天吃苹果这样的健康食物。
例：Whenever I get sick my mother always reminds me to take care of myself by saying, “An apple a day keeps the doctor away.”
3、the apple of my eye：掌上明珠
例：My daughter is the apple of my eye; she makes me happy every day.
4、(like) comparing apples and oranges: 在讨论两个不相同的事物，但又试图把它们与相同的事物一样进行比较的时候，可以使用这种表达。
例： You can’t compare who works harder, me or you; I am a teacher and you are a fisherman, and that is like comparing apples and oranges.
5、one rotten apple spoils the whole barrel: 一个坏人可以对他身边的每个人产生坏的影响，会让周围的人做出不好的行为。
例：Jimmy is the rotten apple that spoils the barrel in my class, I wish I didn’t have to be his teacher all year.
例：I was picked to join the basketball team and you weren’t. How do you like them apples?
来源 : 沪江英语