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•    Aboutfiveyearsago,whenthefirstgenerationofwearablefi...

• 问题详情：   Aboutfiveyearsago,whenthefirstgenerationofwearablefitnesstrackersbecamepopular,theywereannouncedasthedawnofarevolution.Healthexpertsandbusniesspeoplealikesaidthatgivingpeopleaccesstoreal-timecalorie(卡路里)-burningandstep-countdatawould...
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