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motorboat 汽（机动）船
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a motor-car 汽车
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engine指汽车、飞机等的发动机：
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He couldn’t get his engine started．他没能把发动机开动起来。
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An electric spark ignites the petrol in a car engine．电火点燃汽车发动机中的汽油。
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machinery是机器的总称，为不可数名词：
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How much new machinery has been installed？安装了多少新机器？
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I saw no big machinery at that factory．在那家工厂我没看见多少大机器。
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579 mad—insane—crazy—mentally ill
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mad表示“疯癫的”：
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She went mad after the death of her son．她儿子死后她疯了。
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Van Gogh had periods during which he was completely mad．梵·高有几段时间完全疯了。
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有时表示“生气的”、“气得要命的”：
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What is Henry so mad about？亨利为什么那么生气？
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be mad about表示“特别（非常）喜欢”：
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I‘m mad about tennis．我非常喜欢打网球。
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Some girls are mad about going to dances．有些姑娘特别喜欢参加舞会。
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insane也表示“疯癫的”、“神经错乱的”：
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Insane people are kept in asylums．疯人都关在疯人院。
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The psychiatrists declared the killer insane．精神病学家宣布杀手是疯子。
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When people are insane, they are put in mental hospital to be cured．人神经错乱时，被送到精神病院治疗。
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这个词还可表示“发疯的”：
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It’s completely insane to fly in this weather．这样天气出去飞行简直是发疯。
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an insane attempt 发疯的企图
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an insane action 发疯的举动
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