"lock down" in Chinese (Simplified)
封锁封闭 (安全/疫情原因)
Definition
为安全等原因，防止人员进出以确保场所安全，常用于紧急情况或疫情时。
Usage Notes (Chinese (Simplified))
“lock down”常用于紧急或极端情况下，如疫情、暴力威胁。名词为“lockdown”。不要和“lock up”（上锁）或“shut down”（关闭运作）混淆。常见搭配：“lock down the city”、“put on lockdown”。
Examples
They locked down the school after hearing a threat.
听到威胁后，他们**封锁**了学校。
The city will lock down tonight to stop the virus spreading.
城市今晚将**封锁**以阻止病毒传播。
Everyone had to lock down during the emergency.
紧急情况下所有人都必须**封锁自己**。
The government decided to lock down the entire region for two weeks.
政府决定对整个地区**封锁**两周。
If there’s a fire alarm, teachers know exactly how to lock down their classrooms.
如果火警响起，老师们都知道怎么**封锁**教室。
After the escape, the prison was immediately locked down to search for the missing inmate.
逃跑后，监狱立刻**封锁**起来以寻找失踪的囚犯。