red alert
noun [ C ] uk/ˌred əˈlɜːt/ us/ˌred əˈlɝːt/
紧急戒备状态;紧急警报
(the state of being ready to deal with) a sudden dangerous situation
The army was on red alert against the possibility of an attack. 军队进入紧急戒备状态,随时准备应付可能发生的袭击。
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