Chinese soldiers from border defense regiments take physical trainings braving minus 20 degree temperature in Heihe, Heilongjiang province on November 29, 2015. Located at 50 degrees north latitude, Heihe city neighbors Blagoveshchensk in Russia across the Amur River, or Heilong Jiang. Temperature dips to as low as minus 50 C in its half-year-long winter. (Photo/CFP)
