air defense的用法和样例：

例句

用作名词(n.)

Here in Haifa, air sirens continue to sound.防空警报仍未在海法撤销。
All lights are blacked out during air defence exercises.在防空演习时对一切灯火都实行管制。

词汇搭配

air defense artillery防空炮
air defense warning conditions空防预警状况...

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