单词	air defense
释义	air defense noun : the means, techniques, and organizations devoted to preventing or minimizing the effects of attack by enemy aircraft or guided missiles Word History First Known Use 1916, in the meaning defined above
随便看	ion propulsion ion rocket ion scale ion trap ion vehicle ion-ex Iona ionated ionateed ionateing ionates ionating Ionesco bias-ply tire biased biaser biases biasest biasing biasings biasness biasnesses biassed biasser biasses

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