CNN's Jennifer Gray explains what is a "polar vortex" and what to do if you find yourself in very cold temperatures.
원문출처 : https://www.cnn.com/videos/weather/2014/11/11/orig-what-is-a-polar-vortex-jennifer-gray-npr.cnn
원문출처 : https://www.cnn.com/videos/weather/2014/11/11/orig-what-is-a-polar-vortex-jennifer-gray-npr.cnn