off的词性：
adv.（副词）
1.From a place or position:
离开：离开一个地方或职位：
用法与例句：
drove off.
开走
2.At a certain distance in space or time:
一段时间,一段距离：在时间上或空间上有一定距离：
用法与例句：
a mile off; a week off.
一英里远；放一星期的假
3.From a given course or route; aside:
远离,离开：离开给定的道路或路线；在一边：
用法与例句：
swerved off into a ditch.
转弯掉进沟里了
4.Into a state of unconsciousness:
进入一种无知觉的状态：
用法与例句：
I must have dozed off.
我一定是打盹睡过去了
5.So as to be no longer on,attached,or connected:
不附着,不连接：不再有、不再带有或联结：
用法与例句：
shaved off his mustache.
刮掉了他的胡子
6.So as to be divided:
分割：
用法与例句：
marked off the playing field by yards.
以码来区隔球场
7.So as to be no longer continuing,operating,or functioning:
不继续运行：不再继续、不再工作或发挥作用：
用法与例句：
switched off the radio.
关掉了收音机
8.So as to be completely removed,finished,or eliminated:
完全搬走、完成或排除：
用法与例句：
kill off the mice.
杀光老鼠
9.So as to be smaller,fewer,or less:
变小,变少：更小、更少或几乎没有：
用法与例句：
Sales dropped off.
销售量下降
