air alert
参考词典中air alert的常规释义：
基本释义
- n.空袭警报
英英解释
3个名词解释
- the time period during which military and civilian agencies are prepared for an enemy air attack
- the condition in which combat aircraft are airborne and ready for an operation
[例]- aircraft in the Mideast are on air alert
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- the warning signal that begins an period of preparation for an enemy air attack
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