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讲解文本：
grind one"s teeth 磨牙grind 磨，碾Some people grind their teeth while they are asleep.有些人睡觉时磨牙齿。My roommate Jack always grinds his teeth in his sleep, which is a totally disaster.我室友Jack喜欢睡觉磨牙，这对我就是个灾难。
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