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Photo taken on Dec. 7, 2017 shows plant covered with frost on "Daxue" (Greater Snow), the 21st of the 24 solar terms, beside Longquan Lake of Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Photo taken on Dec. 7, 2017 shows plant covered with frost on "Daxue" (Greater Snow), the 21st of the 24 solar terms, beside Longquan Lake of Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)