at+地点/空间/平面

例如:in London/ in the kitchen/ in the field

on 上面，某个平面上，或者与一个面有所接触过

on the wall/ on the roof

at+事件/某个具体的点的附近

at the bus station/ at the door/ at the party

特殊用法:

1:长在树上用on the tree,外来物在树上用in the tree

there are some birds in the tree

there are many apples on the tree

2:除car/ taxi外，其他交通工具用on

in a car/ in a taxi

on a bus/ on a ship