单词：air defense
air defense的用法和样例：
例句
- 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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