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.
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.
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.
大多数海洋生物需要氧气才能生存，因此死亡区对于许多水生物种来都证明是致命的。
Most marine organisms need oxygen for survival, and dead zones prove fatal for many aquatic species.
大多数海洋生物需要氧气才能生存，因此死亡区对于许多水生物种来都证明是致命的。
Most marine organisms need oxygen for survival, and dead zones prove fatal for many aquatic species.
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