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In e-city bicycle system, bikes are no longer single individuals, which are connected with the whole city to form a circulation system. Users transport electricity to the city. The city provides locks for users. The utilization rate of bikes can be increased. This can not only cut the automobile exhaust, but also alleviate the pollution caused by thermal power generation because bike users can generate electricity for the city. As is known to all, automobile exhaust and thermal power generation are major causes of haze. In the system, biking is no longer an individual activity but an activity which can benefit the global environment.