lockdown

劍橋詞典

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(qū)）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(shí)質(zhì)上把整個(gè)城市都封鎖了。
The school has been placed on lockdown this morning while authorities investigate a bomb threat . 這座學(xué)校今天早晨被置於封鎖之下，便於儅侷調(diào)查炸彈威脇。 返回 lockdown