But even the most speculative recreations of early human society are based on a few essential facts.
然而即便是在早期人类社会，投机娱乐也是基于一些重要的事实。
As a way of relief by private power, self-help behavior system has already existed in the early human society.
自助行为制度作为私力救济的一种方式，在人类社会早期就已经存在。
In addition, the researchers found evidence of a sophisticated early human society that used sharpened flakes of stone.
此外，研究人员还发现证据表明这是一个成熟的早期人类社会：他们使用磨砺过的石斧。
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