原文: Freeride mountain bikers embark on an expedition to the Arctic’s uninhabited Axel Heiberg Island, where they descend the longest, most challenging big mountain lines ever ridden in this rapidly changing environment. 机器翻译: 搭便车的山地自行车手开始了对北极无人居住的阿克塞尔海堡岛的探险,在那里,他们沿着这条在快速变化的环境中行驶过的最长、最具挑战性的大山线下山。