it lightens the skies in the far north. 照耀在遥远的北方天空

17. and they will not see the sun again for four months.
    而且整整4个月见不到太阳
18. Surely no greater ordeal is faced by any animal.
    这绝对是动物们经受过的最严酷的考验
19. As the sun departs from the Antarctic
    太阳已远离南极
20. it lightens the skies in the far north.
    照耀在遥远的北方天空
21. It's March
    现在是三月
22. and light returns to the high Arctic,
    阳光重返北极腹地
23. sweeping away four months of darkness.
    驱走了4个月的黑暗

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 20 行