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2013-05-23 12:21
求翻译：CDBAB,CACHow much sleep do we need? We are all different. Some people need only three or four hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average of seven to eight hours a night. After age fifty, the average sleep time goes down to 6.5 hours a night. Most people have a nigh是什么意思？ 待解决
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CDBAB,CACHow much sleep do we need? We are all different. Some people need only three or four hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average of seven to eight hours a night. After age fifty, the average sleep time goes down to 6.5 hours a night. Most people have a nigh
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