单词：pusher propeller
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上次我们已经讲了两个由paper这个词发展而来的习惯用语，今天我们继续讲两个。千百年来人们书面交流必须依靠纸张。不论是报章杂志还是书籍文件用的都是纸。纸的功劳不可抹煞，然而近年
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