at+地點(diǎn)/空間/平面
例如:in London/ in the kitchen/ in the field
on 上面院领，某個(gè)平面上，或者與一個(gè)面有所接觸過
on the wall/ on the roof
at+事件/某個(gè)具體的點(diǎn)的附近
at the bus station/ at the door/ at the party
特殊用法:
1:長(zhǎng)在樹上用on the tree,外來物在樹上用in the tree
there are some birds in the tree
there are many apples on the tree
2:除car/ taxi外跺嗽，其他交通工具用on
in a car/ in a taxi
on a bus/ on a ship
