Backin2001,PenHadowandItraveledtotheNorthPole.Onemornin...
问题详情：Backin2001,PenHadowandItraveledtotheNorthPole.Onemorningwe’djusttakendownourtentandstartedskiing.Penwasinfront,andIwasfollowinghim.SuddenlyIgotastrangefeelingthatsomethingwasbehindus.Istopped...