air alert 空袭警报 ; 空中警戒 ; 美国着名弹跳力训练训练计划 ; 空中待战
air alert warning [军] 空袭警报
air alert mission 对空警戒任务
sound air alert 发出空袭警报
air alert status 空中待战状态
air alert method 空中待战法
cancel air alert 解除空袭警报
air alert fighter 巡逻战斗机
broadcast an air alert 广播空袭警报
air alert zone 待战空域
There were 15 minutes between the first air raid alert and the sounding of the all-clear signal.
从第一个空袭警报到警报解除号音其间有15分钟。
During the air pollution red alert, the Beijing Commission of Education ordered all kindergartens, primary schools and middle schools to suspend classes.
在空气污染红色预警期间，北京市教委下令让所有幼儿园、小学和中学停课。
The alert level "is now at a higher class" than in 2002, says Air Force Brig. Gen. Jung Jae-bu, commander of the 20th Fighter Wing.
“目前的警戒水平”高于2002年，第20战斗机飞行中队指挥官，空军准将郑在卜(音)表示。
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