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

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

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

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

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

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

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

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