| 例句 |
noun a three-day lockdown of American airspace美国为期三天的领空关闭 Prisoners have been placed on lockdown to prevent further violence at the jail. 已对囚犯实行活动限制，以免狱中再出现暴力行为。 The prison governor ordered an instant lockdown (= prisoners were locked in their cells). The city schools were in lockdown. |