Ever looked down and wondered how the mountain snow beneath you became so smooth, compact and perfect for skiing?
원문출처 : http://www.cnn.com/2017/03/17/sport/snowcat-skiing-snowboarding-snow-aspen/index.html
원문출처 : http://www.cnn.com/2017/03/17/sport/snowcat-skiing-snowboarding-snow-aspen/index.html