新东方在线：考研英语核心词汇64

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in the back of 在…后部(里面);
    on the back of 在…后部(外面);
    be on one’s back卧病不起.
    造句：
    You ride in the back of the car with yourbrother.
    你跟你弟弟坐汽车的后座.
    You hit me on the back of the head.
    你砸着我的后脑勺啦。
    He was on his back for 3 weeks.
    他有三个星期卧病在床。