Around the country, doctors in pediatric sports medicine say it is as if they have happened upon a new childhood disease, and the cause is the overaggressive culture of organized youth sports.

• 美国从事儿童运动医学研究的医生们日前表示，他们发现一些少年运动员的身体受到严重损伤，而这种损伤完全是由于运动训练过量所致。