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- 问题详情：Itisnotunusualtoseeyourdeskmateyawn(打呵欠)ashecomplainsthathedidn’thaveagoodsleepthenightbefore.Manyteensdon’tgetenoughsleepbecausetheyhavetoomuchhomework，whichkeepsthemupatnight.Someteenscannotsleepatnightevenwhentheywantto.Studiesshowthat...
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