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Tourists ride camels at the Mingsha Mountain and Crescent Spring scenic spot in Dunhuang City, northwest China's Gansu Province, April 29, 2018. (Xinhua/Zhang Xiaoliang)

Tourists ride camels at the Mingsha Mountain and Crescent Spring scenic spot in Dunhuang City, northwest China's Gansu Province, April 29, 2018. (Xinhua/Zhang Xiaoliang)