red alert
noun /ˌred əˈlɜːt/
/ˌred əˈlɜːrt/
[uncountable, singular]- a situation in which you are prepared for something dangerous to happen; a warning of this
紧急戒备状态；紧急警报 - Following the bomb blast, local hospitals have been put on red alert.
炸弹爆炸之后，当地医院一直处于戒备状态。 - The water authority has issued a red alert until the cause of the pollution has been removed.
水务局已经发出了红色警报，直到污染的原因被消除。
- Following the bomb blast, local hospitals have been put on red alert.