许多物种非常相似，因此有可能杂交繁衍出后代，而且这种情况可能经常在自然界中发生；但对于大多数物种来说，这一规则大体适用。

Many species are similar enough that hybrid offspring are possible and may often occur in nature, but for the majority of species, this rule generally holds.

youdao

相对于绝大多数物种的存在方式而言，人类生活在一个很小的狭长地带，那里几乎没有剩余食物，因此可以以相对平等的方式生存。

For most of the species's existence, humans lived in small foraging bands that had little material surplus and therefore enjoyed a relatively egalitarian existence.

youdao

对于大多数动物物种这样的个体很小可能幸存和繁衍。

For most animal species such individuals are less likely to survive and reproduce.

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