Comparedtoadults,childrenseemtobemovingconstantly．Soit'...
问题详情：Comparedtoadults,childrenseemtobemovingconstantly．Soit'snosurprisethatmostparentswhoarequizzedabouttheirchild'sphysicalactivityleveldescribetheirchildrenasfairlyactive．Butanewstudyofnearly2,00...