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Tourists walk on the Nanmen square near the Baota Mountain scenic area in Yan'an, northwest China's Shaanxi Province, April 21, 2019. (Xinhua/Shao Rui)
Tourists walk on the Nanmen square near the Baota Mountain scenic area in Yan'an, northwest China's Shaanxi Province, April 21, 2019. (Xinhua/Shao Rui)