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Tourists ride camels at the Mingsha Mountain and Crescent Spring scenic area in Dunhuang, northwest China's Gansu Province, May 2, 2019. (Xinhua/Zhang Xiaoliang)

Tourists ride camels at the Mingsha Mountain and Crescent Spring scenic area in Dunhuang, northwest China's Gansu Province, May 2, 2019. (Xinhua/Zhang Xiaoliang)