例1：The police have shut
off
all streets leading to the city.
（警⽅
封闭
了所有通往这座城市的道路。）
例2：The area in the park where the kids play is fenced
off
for safety reasons.
（为了安全起⻅，公园⾥⽤围栏把孩⼦们玩的场所
隔开
了。）