给出了公共自行车交通系统(PBS)的概念，分析总结了欧洲及国内部分城市PBS的实践与经验教训。
The paper delivers a conceptual definition of public bicycle systems (PBS), along with a summary of experience and lessons of PBS practice both in Europe and China.
这就是丹麦人骑自行车的原因，也就是丹麦拥有世界上最好的公共交通系统的原因。
That's why people in Denmark ride bikes or use one of the best public transport systems in the world.
就在爆炸事件发生当天，在短短几个小时之内，自行车商店的存货一抢而空，这次爆炸使伦敦的交通系统瘫痪了几个星期。
On the day of the bombings, which crippled the transportation system for weeks, bicycle shops sold out of their stock within hours.
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