VitaminDhelpsbonesandmusclesgrowstrongandhealthy.Lowlev...
问题详情：VitaminDhelpsbonesandmusclesgrowstrongandhealthy.LowlevelsofvitaminDcanleadtodiseasessuchasrickets(佝偻病),mainlyfoundinchildren.Thethinningofboneisacommonproblemaspeople,especiallywomen,getol...