柯林斯词典snow line 1. N the altitudinal or latitudinal limit of permanent snow 雪线 返回 snow line剑桥词典 the snow line the level on a mountain above which snow is found for most or all of the year 雪线（高山上终年积雪的最低界线） above/below the snow line 雪线以上／以下 返回 snow line