- 问题详情:Anewstudy,aprojectoftheresearchersfromtheUniversityofPittsburghinPennsylvania,findsthefitnesstrackerprobablydoesnothelpwithweightloss. Thedevicesaredesignedtorecordyourphysicalactivity.Theyareusuallywornaroundthewrist,wheretheymeasureape...
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