The origin of extreme sport and the characteristics of the event were discussed and effects of extreme sport on health were expounded.
论述了极限运动的起源、项目特点，阐明了极限运动对健康的影响。
The origin of extreme sport and the characteristics of the event were discussed and effects of extreme sport on health were expounded.
论述了极限运动的起源、项目特点，阐明了极限运动对健康的影响。
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