Comparedtoadults,childrenseemtobemovingconstantly．Soit'...
問題詳情：Comparedtoadults,childrenseemtobemovingconstantly．Soit'snosurprisethatmostparentswhoarequizzedabouttheirchild'sphysicalactivityleveldescribetheirchildrenasfairlyactive．Butanewstudyofnearly2,00...