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Tourists visit the Mogao Caves in Dunhuang, northwest China's Gansu Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Fan Peishen)
Tourists visit the Mogao Caves in Dunhuang, northwest China's Gansu Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Fan Peishen)