表 空 间 位 置 及 方 向 方 位 的 介 词 at， on， in at指一个点或小地方；
in指一个地区或大地方空间内；on在某一平面或线上面。 They arrived at the village at ten.
Your pencil is in the desk.
Your pencil is on the desk.
on， above， over on与物体接触反义词为beneath；over在s a book on the desk and a pen beneath the book.
Theres a lamp over the desk and a bag under the table.
Jacks bedroom is above mine on the second floor.
over， across， through across表面跨过；
through从中间或从头至尾穿过；
over从上空越过。 Hes swimming across the river.
They walked through the forest.
A plane is flying over the city.
at， beside， by， next to， near at靠得最近；