on top of与at the top of

on top of:
在...之上
例句与用法:
1.There is a vane on top of the building.
在大楼的顶端有一只风信旗.
2.He watched the game from his perch on top of the wall.
他在墙头居高临下看比赛.
3.On top of borrowing 50,he asked me to lend him my car.
他向我借了50英镑,此外还向我借汽车.
4.Put this record on top of the others.
把这张唱片放在其他唱片上面.
5.The farm sits on top of the hill.
那个农场在山顶上.
6.From our perch up there on top of the cliff we can see the whole town.
我们从悬崖顶上的高处能看到城市的全景.
7.The bird has a tuft of red feathers on top of its head.
这只鸟的头顶上有一小簇红色的羽毛.
8.There is a bird on top of the house.
房子顶上有只鸟.
at the top of:
a.在...的顶上(以最高的)

前者:在..上面(顶部)
后者:在..上部或达到顶点..