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BNC: 0 COCA: 23113
lockdownnoun [ C or U ]uk/ˈlɒk.daʊn/ us/ˈlɑːk.daʊn/ mainly US

a situation in which people are not allowed to enter or leave a building or area freely because of an emergency(建筑或地区)因紧急情况而被封锁了

The Secret Service is imposing a virtual lockdown on the city.特勤局实质上把整个城市都封锁了。
The school has been placed on lockdown this morning while authorities investigate a bomb threat.这座学校今天早晨被置于封锁之下,便于当局调查炸弹威胁。

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