an air raid alarm

• n. 空袭警报

an air raid alarm的用法和样例：

例句

用作名词 (n.)

1. An air-raid alarm sounded in the depths of night.
   深夜响起了空袭警报。
2. One should not run about aimlessly during an alert.
   空袭警报期间不可到处乱跑。