A woman bundles up against bitter cold, and her hat and scarf are covered with frost due to low temperatures in Yakeshi, Hulunbuir, north China's Inner Mongolia Autonomous Region, on Jan. 11, 2014. A cold front has brought days of bitter cold to Hulunbuir in north China's Inner Mongolia Autonomous Region, leaving much of the city grappled with frigid temperatures as low as minus 40 degrees Celsius. [Photo/Xinhua]