Photo taken on Sept. 23, 2017 shows a bridge in the underground Dragon Cave in Longdong Village of Xuanwei City, southwest China's Yunnan Province. (Xinhua/Yang Zongyou)
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Photo taken on Sept. 23, 2017 shows a bridge in the underground Dragon Cave in Longdong Village of Xuanwei City, southwest China's Yunnan Province. (Xinhua/Yang Zongyou)