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Tourists visit the Crescent Spring and Singing Sand Dune scenic area in Dunhuang, northwest China's Gansu Province, Oct. 2, 2017. (Xinhua/Zhang Xiaoliang)
Tourists visit the Crescent Spring and Singing Sand Dune scenic area in Dunhuang, northwest China's Gansu Province, Oct. 2, 2017. (Xinhua/Zhang Xiaoliang)