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Photo taken on Dec. 4, 2019 shows birds looking for food at a wetland in Heyang County, northwest China's Shaanxi Province. (Photo by Zhao Xiaogang/Xinhua)
Photo taken on Dec. 4, 2019 shows birds looking for food at a wetland in Heyang County, northwest China's Shaanxi Province. (Photo by Zhao Xiaogang/Xinhua)