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今天我们要学的词是 lockdown. Lockdown 名词，有封锁，禁止出入的意思。Three school were placed on lockdown in response to a bomb threat that turned out to be a hoax. 炸弹威胁让三所学校启动封锁状态，结果发现所谓的炸弹威胁是有人恶作剧。Sierra Leone imposed a three-day nationwide lockdown, ordering people off the streets, in an effort to fight the outbreak of Ebola. 为了控制埃博拉病毒的扩散，塞拉利昂实行了三天的全国戒严，不许民众上街。 好的，今天我们学习的词是 lockdown, lockdown, lockdown...
