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Tourists visit the Mingsha Mountain and Crescent Moon Spring scenic area on the second day of a three-day Qingming Festival national holiday in Dunhuang, northwest China's Gansu Province, April 6, 2019. (Xinhua/Zhang Xiaoliang)

Tourists visit the Mingsha Mountain and Crescent Moon Spring scenic area on the second day of a three-day Qingming Festival national holiday in Dunhuang, northwest China's Gansu Province, April 6, 2019. (Xinhua/Zhang Xiaoliang)