where the snow is unmarked by footprints. 雪地上没有被踩过的脚印

102. The needle-shaped leaves of the conifers are virtually inedible
     针叶树的针状树叶根本不能食用
103. so this forest supports very little animal life.
     所以生活在这片森林里的动物非常稀少
104. It's a silent place
     这是个寂静的地方
105. where the snow is unmarked by footprints.
     雪地上没有被踩过的脚印
106. In the Arctic winter
     每到北极冬季
107. snow forms a continuous blanket across the land.
     雪便为这片土地盖上一层广袤无边的银毯
108. But as spring creeps up from the south
     可是随着春天渐渐从南方赶来

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 105 行