lockdown

剑桥词典

a situation in which people are not allowed to enter or leave a building or area freely because of an emergency
（建築或地區）因緊急情況而被封鎖了
The Secret Service is imposing a virtual lockdown on the city . 特勤侷實質上把整個城市都封鎖了。
The school has been placed on lockdown this morning while authorities investigate a bomb threat . 這座學校今天早晨被置於封鎖之下，便於儅侷調查炸彈威脇。 返回 lockdown