be covered in 和 be covered on有什么不同?

e covered in/with 被……覆盖如：She wore so much jewellery that she seemed to be covered in gold。她戴了那么多首饰,看上去象是包在金子里似的。be covered on 可以表示范围,也可以表示电视台的直播。如：What’s going to be covered on the test?考试的范围是什么?Next season's live horse racing will not be covered on RTHK。香港电台将不会直播下季的赛马。