- Two and a half million years ago,
250万年前 - the mammals were faced with a new challenge.
哺乳动物面临一个新的挑战 - What had been a slow cooling of the planet
过去缓慢的地球降温 - intensified.
加速了 - The start of an ice age.
冰河时代开始 - From its frozen wastes would come a new force...
从冰封的废土中 将出现一股新的力量 - a mammal armed with more intelligence and adaptability than any before.
一种哺乳动物 拥有史上最强的智力和适应性
intensified. 加速了
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