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Tourists enjoy the scenery in Jiulongshan ecological restoration park constructed on abandoned mines in Wu'an City, north China's Hebei Province, Sept. 26, 2019. (Xinhua/Wang Xiao)

Tourists enjoy the scenery in Jiulongshan ecological restoration park constructed on abandoned mines in Wu'an City, north China's Hebei Province, Sept. 26, 2019. (Xinhua/Wang Xiao)