A woman takes her child to try a bike with square wheels at Ningxia Science and Technology Museum in Yinchuan, Ningxia Hui Autonomous Region, Oct. 7, 2016, the last day of China's National Day holiday. (Photo/Xinhua)
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A woman takes her child to try a bike with square wheels at Ningxia Science and Technology Museum in Yinchuan, Ningxia Hui Autonomous Region, Oct. 7, 2016, the last day of China's National Day holiday. (Photo/Xinhua)