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A contestant takes part in an unmanned aerial vehicle (UAV) obstable course race during a juvenile science festival in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Sept. 21, 2019. (Xinhua/Feng Kaihua)
A contestant takes part in an unmanned aerial vehicle (UAV) obstable course race during a juvenile science festival in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Sept. 21, 2019. (Xinhua/Feng Kaihua)