[00:00:01]The poles are permanently capped with ice. 冰天雪地是两极永恒的主题 [00:08:21]Nowhere is colder, 对于生命 [00:10:55]windier or more hostile to life. 那里的酷寒 狂风是最严苛的挑战 [00:17:55]I'm standing at the North Pole - 我的脚下就是北极点 [00:20:44]the very top of the Earth. 世界之巅 [00:23:43]Up here, it's easy to see 为何极地地区如此寒冷 [00:26:15]why the polar regions are so cold. 身临其境时 体会更加深刻 [00:29:22]The sun never rises high enough in the sky to warm my back 太阳的直射角度很小 鲜有阳光照射下来 [00:35:11]and those rays that do strike the surface 而即使光线到达了地表 [00:38:33]are mostly reflected back from this great whiteness. 大部分也会被这白茫茫的冰雪反射回去 [00:43:42]But the fundamental problem is that there's no sun here at all 但最重要的问题是 这里有半年的时间 [00:49:14]for half the year. 完全没有阳光照射 [00:52:08]The polar winter is unrivalled in its harshness. 极地冬季的严酷 无与伦比 [00:56:07]A night that lasts for months. 一个夜晚可持续数月之久 [01:00:06]Only the toughest stay, as temperatures plunge 随着温度骤降到零下70摄氏度 [01:03:22]to minus 70 degrees centigrade. 只有最顽强的生命才能存活下来 [01:06:00]And yet, the greatest challenge to life here is not the cold, 然而对于生命来说 最大的挑战并非寒冷 [01:10:49]but the extreme swings between the seasons. 而是剧烈的四季更迭 [01:15:58]When the sun finally returns, 当太阳再次升起时 [01:18:43]an extraordinary transformation begins. 一次翻天覆地的转变开始了 [01:21:08]This frozen world begins to melt away. 这个冰冻的世界开始融化

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