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CA high school soccer player leaps into the air,hits the ballwith his head and directs it to a teammate.Amid today's growingawareness surrounding head injuries in sports,would wearinghelmets protect the teen and prevent a possible concussion(脑震荡)？Almost not.Two top doctors who specialize in sportshelmetinjuries-Dr.James Robinson and Dr.Larry Lemak,founders of Lemak SportsMedicine,said that there was no good scientific evidence that helmets could reducethe rate of concussion.Both of them regarded proper training,not helmets,as thebest concussion prevention for soccer players.That doesn't mean there's no need to worry about soccer concussions.For boyssoccer,concussions accounted for 23 percent of all game injuries and 10 percentof all practice injuries,according to the study.For girls soccer,the study foundconcussions accounted for 36 percent of game injuries and 31 percent of practiceinjuries.Knowing that,why isn't a helmet useful?Isn't some protection better than noneat all?The doctors outlined several reasons helmets provide little protectionFirst,wearing a helmet makes the head heavier.A heavier upper part may bemore dangerous to the beginners.Secondly-and perhaps most importantly for girls,whose neck muscles are often weaker than boys-a helmet makes the head heavier.Imagine a top-heavy head,Robinson said,which increases the risk of falls.Since girlsalready face a heightened concussion risk,helmets could be especially dangerousfor them.Lastly,wearing helmets often gives teens a false sense of security.Whenhelmets were matedated()in hockey,head injuries increased "because they feltunbeatable.""Sometimes the kids wearing helmets are more daring,"said ChadHarrelson,boys soccer coach at St.Paul's in Mobile,"because they think they havethat added layer of protection."Both coaches and doctors agree on three main ways to prevent soccerconcussions.Firstly,learn proper rules and follow norms.Players who understandsoccer's rules and behave themselves are less likely to put themselves in harm's way.Secondly,promote proper technique.It's important to have players know where otherplayers are positioned.This reduces contact and can prevent head-to-head collisions高二英语第7页（共12页）