体育竞赛是体育运动的基本特征,这是体育运动的竞技性和体育运动作为组织化的社会文化方式决定了的.本文探讨了体育竞赛与奖励的关......

Overcrowding has become a non negligible issue for metros in China.This paper analyzes the impact of crowding in metro c......