在动物王国里，我们通常把这类事情称为自然选择。
In the case of the animal kingdom, we often call this type of thing "natural selection."
在动物王国里，一些至关重要的课程——往往也是极具有挑战性的——出现在生命最初时刻。
Across the animal kingdom, some of the most essential lessons - and the most extreme challenges - occur in the first moments of life.
苍蝇博士：每个人都有一个潜在的动物基因，这将让他们在动物王国里变回自己应有的位置！
Baxter Stockman: Inside every human, there's a dormant animal gene. This will return them to their rightful place in the animal kingdom!
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