尽管原始，这些武器给了早期人类一个巨大的优势，借此获得热量丰富的猎物，保卫自己免受食肉动物或其他人的攻击。

Primitive as these weapons may have been, they gave early humans a huge advantage in hunting for calorie-rich meat and for defending themselves from predators or other humans.

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对这个的一个解释是在人类这样需要有大量的母性关怀的动物中，女性认为身体上的攻击性是很难承担的。

One idea to explain this is that in animals such as humans, where there is a lot of maternal care, females find physical aggression less affordable.

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索贝尔指出，从进化方面来讲，控制对另一个动物的攻击性有很大的价值。

In evolutionary terms, the ability to control aggression in another animal can have major value, Sobel pointed out.

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