Pedestrian in thick clothing walk on a snow-covered sidewalk in Harbin, capital of northeast China's Heilongjiang Province, March 10, 2013. Temperature in Harbin significantly dropped to minus 19 degrees Celsius due to cold air on March 10. (Xinhua/Wang Song)

A rider in thick clothing is seen on a street in Harbin, capital of northeast China's Heilongjiang Province, March 10, 2013. Temperature in Harbin significantly dropped to minus 19 degrees Celsius due to cold air on March 10. (Xinhua/Wang Song) 

Pedestrian in thick clothing walk on a snow-covered sidewalk in Harbin, capital of northeast China's Heilongjiang Province, March 10, 2013. Temperature in Harbin significantly dropped to minus 19 degrees Celsius due to cold air on March 10. (Xinhua/Wang Song)