its impact was huge. 影响巨大

1. For 90% of our planet's history,
   地球历史90%的时间中
2. it has been too warm for ice to form.
   温度都太高 无法形成冰冻
3. So when the Ice Age hit two and a half million years ago,
   所以 2500万年前 当冰河时代突然袭来之时
4. its impact was huge.
   影响巨大
5. This is the story of a great freeze
   本集讲述的是大冰冻的故事
6. and the rise of a dynasty
   以及一个王朝的兴起
7. that would bring life to the brink of extinction.
   将生命推向灭绝边缘

来自《我们星球上的生命 第一季 第八集 Life on Our Planet S01E08 冰与火的世纪》第 4 行