人们对鳄鱼的原始恐惧太难根除。

Primal fear, too, was hard to eradicate.

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每个人的原始恐惧死亡和多么可怕的在自己的脑海中。

Everyone's primal fears of death and how horribly it can play out in your own mind.

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在人类的原始祖先中，那些敢于走出洞穴到最遥远的地方寻觅更好的食物者，或者克服对火的恐惧者，自然积累了显著的优势，超过他们比较温顺的亲属。

Among our primitive ancestors, those who ventured farthest from their caves in search of better food or who overcame their fear of fire accrued significant advantages over their meeker kin.

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