Inthepastdecadethepopularityofrockclimbinghasgreatlyin...
問題詳情： Inthepastdecadethepopularityofrockclimbinghasgreatlyincreased,andsohasthenumberofinjuries.Ithasbeenestimatedthatrockclimbingisnowenjoyedbymorethan9millionpeopleintheUSeachyear.Studyfindingsr...