关于地点介词的选用

at. 小地方。We arrived at my home.
in. 大地方。We arrived in New York.
on. 开阔的地方，或有些词语前面。如：beach, bay, coast, island ...They live on an island.

At:1.at a meeting place or location: at home, at the club, at the gate

2.at the edge of something: sitting at the desk

3.at the corner of something: turning at the intersection (the
junction)

4.at a target: throwing the snowball at Lucy

On:1.on a surface: placed on the table, hanging on the wall

2.on a street: the house on Spring Street, on Hampton Boulevard, on Fifth Avenue

3.on an electronic medium: on television, on the Internet, on the radio, on the Calculator

In:1.in an enclosed space: in the garage, in the closet, in the envelope, in a bottle

2.In a geographic location: in San Diego, in Nanchang, in Syracuse, in the Appalachian Mountains, in the Mississippi valley

3.In a print medium: in a book