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Photo taken on Dec. 21, 2017 shows the frozen Qinghai Lake, China's largest inland lake and biggest saltwater lake, in northwest China's Qinghai Province. (Xinhua/Jia Haiyuan)
Photo taken on Dec. 21, 2017 shows the frozen Qinghai Lake, China's largest inland lake and biggest saltwater lake, in northwest China's Qinghai Province. (Xinhua/Jia Haiyuan)