1、over作介词时是越过、在…上面、由于的意思。
2、例如，He looked at himself in the mirror over the table.他对着桌子上方的镜子照了照。
3、作为副词出现，表示再、倒下、从一边至另一边的意思，看下面例句，The car skidded off the road and rolled over and over. 汽车滑出路面不断翻滚。
4、Try not to knock that vase over. 小心别把花瓶碰倒了。The wind must have blown it over. 准是风把它吹倒了。
