- For 90% of our planet's history,
地球历史90%的时间中 - it has been too warm for ice to form.
温度都太高 无法形成冰冻 - 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 - its impact was huge.
影响巨大 - This is the story of a great freeze
本集讲述的是大冰冻的故事
it has been too warm for ice to form. 温度都太高 无法形成冰冻
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