例句：

　　He gets commission on top of his salary.

　　他除了薪金之外還拿傭金。

　　He was sound asleep on top of the covers.

　　他在床單上睡得很香。

　　Do you think he's really on top of his job?

　　你認(rèn)為他真的能做好他的工作嗎？