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	plotz plotzed plotzes plotzing plough plough a lone furrow plough a lone/lonely furrow plough a lonely furrow plough one's own furrow plough the same furrow plough-up ploughboy ploughboys ploughed plougher ploughers ploughgang ploughgate ploughhead ploughing ploughings ploughland ploughlands ploughline ploughman

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