Photo taken on early Feb. 2, 2014 shows a flock of wild ducks swimming on the Huaihe River shrouded by heavy fog in the Xuyu County, east China's Jiangsu Province. A yellow alert for heavy fog was issued to warn low visibility of less than 500 meters in large parts of north China, east China and central China on Sunday. (Xinhua/Zhou Haijun) |
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