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不少人把骑自行车视为运动项目,希望通过这项运动来改善身体健康状况。实验表明,在车水马龙的街道上骑车仅一小时,机车排放的废气中所含的微小颗粒便会被骑车者
Many people regard cycling as a sport, hoping to improve their health through this sport. Experiments show that in the busy streets only a hour ride, locomotive emissions contained in the tiny particles will be rider