Perhaps this can partly explain the existence of left-handers in human societies.
也许这可以部分解释人类社会中左撇子的存在。
Oh, implacable march of human societies!
呵，人类社会历久不变的行程！
This is not so very far from most human societies.
这与大部分人类社会里的情形相去不远。
What does this ability tell us about human societies?
这种能力告诉我们关于人类社会的何种信息？
Many more come. And even human societies become more complex.
甚至是人类社会，也变得越来越复杂。
At their extreme, these traits would be highly detrimental for life in traditional human societies.
在极端情况下，这些性格特征会对传统的人类社会造成伤害。
At their extreme, these traits would be highly detrimental for life in traditional human societies.
在极端情况下，这些性格特征会对传统的人类社会造成伤害。
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