A contestant attends a marathon at Yadan National Geological Park in Dunhuang, northwest China's Gansu Province, Oct. 4, 2016, during the National Day holiday. (Xinhua/Zhang Xiaoliang)
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A contestant attends a marathon at Yadan National Geological Park in Dunhuang, northwest China's Gansu Province, Oct. 4, 2016, during the National Day holiday. (Xinhua/Zhang Xiaoliang)
