It's continuously dark 黑夜漫无休止

7. Imagine our world without sun.
   想象一下一个没有太阳的世界
8. Male Emperor Penguins are facing the nearest that exists on planet Earth
   雄帝企鹅正在挑战地球上最严酷的环境
9. winter in Antarctica.
   南极洲的冬天
10. It's continuously dark
    黑夜漫无休止
11. and temperatures drop to minus seventy degrees centigrade.
    气温下降到零下70℃
12. The penguins stay when all other creatures have fled
    其它动物早已逃离 只有企鹅留了下来
13. because each guards a treasure:
    因为每只企鹅都护卫着一件宝贝

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 10 行