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A tourist takes photos of red maple leaves at Qingliang mountain park in Nanjing, capital of east China's Jiangsu Province, Dec. 15, 2018. (Xinhua/Yang Suping)

A tourist takes photos of red maple leaves at Qingliang mountain park in Nanjing, capital of east China's Jiangsu Province, Dec. 15, 2018. (Xinhua/Yang Suping)