Urban public bike service isn't a new phenomenon. Government-sponsored public bike systems have been introduced into many cities in China Mobike, a new kind of public bike rental service, started in Shanghai and has expanded to Beijing. People can use this service by scanning the QR code(二维码) on the bike to unlock the smart lock. The standard cost of this service is 1yuanper 30 minutes. Users can pay with popular mobile payment methods such as Alipay and WeChat. Mobike now has more than 10, 000 bikes in Shanghai, allowing most riders to find a bike anywhere within a diameter(直径) of 300 meters. Many people ride a Mobike for a short trip, such as from home to the subway, subway to the work place or to a grocery store. Experts say Mobike is a good supplement(补充) to the public bike rental service since city people are now fond of “Green Riding”, and environmentally-friendly means of transportation. Just because of this, the company providing the service is increasing the number by hundred every day.

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