表示场所、位置的介词: at,in,on,under,by,near,between.
表示方向的介词: into,out of,along,acros,through,to,from.
at,in
at 在某地点(表示比较狭窄的场所) 返回
at school
at home
at No.2 Baker Street
at a factory
I'll meet him at the Beijing railway station.
in 在某地(表示比较宽敞的场所)
in Beijing
in China
in the world
in the street