Firefighters train to endure the cold during an exercise on a snow-covered square in Changchun, Northeast China's Jilin province, Jan 27, 2011. As temperatures drop to -25C, about 700 soldiers of the Changchun fire brigade participate in a physical training program to build cold resistance. The drill is conducted at least twice a week. [Photo/Asianewsphoto]

Firefighters train to endure the cold during an exercise on a snow-covered square in Changchun, Northeast China's Jilin province, Jan 27, 2011. [Photo/Asianewsphoto]