giant cathedrals of ice marked their entry into uncharted territory. 经过这里的冰山就标志他们进入了未知领域

4. It causes the ice to advance and retreat every year.
   使得冰盖面积每年都在扩大和缩小
5. And all life here is governed by that.
   这里的一切生命都受其影响
6. When the first polar explorers headed south,
   第一批极地探险家前往南方时候
7. giant cathedrals of ice marked their entry into uncharted territory.
   经过这里的冰山就标志他们进入了未知领域
8. Passing the towering spires,
   在经过高耸的冰山的时候
9. they must have wondered what unearthly sights lay in store.
   他们必曾感慨于地球上竟有如此别样的地方存在
10. As they battled on, the ice became increasingly dominant,
    他们继续南上 触目皆是寒冰

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 7 行