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Howmuchsleepisenough? Tostayingoodhealth,someexperti...
問題詳情: Howmuchsleepisenough? Tostayingoodhealth,someexpertintheUSsay,adultsshouldgetseventoeighthoursofsleep.Teenagerneedninetotenhours.Andpre-schoolchildrenneedmorethan10hoursofsleepanight. ...