red alert

• 表示最高级别的紧急状态或危险，要求立即采取行动或保持戒备；常用于军事、航天或危机场景。

A signal or state of the highest level of emergency or danger, requiring immediate action or readiness. Often used in military, space, or crisis contexts.

1. Highest level of warningB2formal

   A signal or state of maximum readiness for an imminent danger or emergency.

   红色警报

   • The military was placed on red alert after the threat was detected.
   • The hospital declared a red alert when the number of patients surged.
   • The weather service issued a red alert for the approaching hurricane.

2. State of extreme urgencyB2informal

   A situation requiring immediate and intense attention or action.

   红色警报

   • When the boss arrives, it's red alert for everyone in the office.
   • The team went on red alert when the deadline was moved up.
   • My phone battery is at 1% — it's a red alert!