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Photo taken on Dec. 18, 2017 shows the scenery of Cangshan Mountain and Erhai Lake in Dali, southwest China's Yunnan Province. (Xinhua/Hu Chao)

Photo taken on Dec. 18, 2017 shows the scenery of Cangshan Mountain and Erhai Lake in Dali, southwest China's Yunnan Province. (Xinhua/Hu Chao)