Mammals that adapted well to the cold dominated these frigid lands... 适应了寒冷的哺乳动物 主宰着这冰雪天地
making them perfectly adapted to hunting in burrows 使它们完全适应了在洞穴中捕猎
They're reptiles, supremely adapted to this dry environment. 它们是极为适应干旱环境的爬行动物
And one group adapted in a way never seen before. 有一群生物以前所未见的方式 适应了这种转变
It's adapted to a life of predation. 它适应了掠食的生活
Only the best adapted will win through. 适者生存
...all perfectly adapted to the challenges of life. 它们全都完美地适应了生命的挑战
The first rule of life, that the best adapted will win through... 生命的第一条法则适者生存