air defense是什么意思 air defense怎么读
air defense的英文翻译是什么意思，词典释义与在线翻译
Noun:- defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness
air defense的用法和样例
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。
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