physicalcontactispar的精選

問題詳情：Inmanysports，physicalcontactispartofthegame.Butwhenathleteshittheirheads，thehitcancauseconcussions（腦震盪）.Concussionshavelongbeenaconcernforprofessionalathletes，butthey'vebecomemorecommonamongyou...