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講解文本:
grind one's teeth 磨牙grind 磨,碾Some people grind their teeth while they are asleep.有些人睡覺時磨牙齒。My roommate Jack always grinds his teeth in his sleep, which is a totally disaster.我室友Jack喜歡睡覺磨牙,這對我就是個災難。
瘋狂練習吧!
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