16. Thus，a regularity for which there are general theoretical grounds will be more readily called a natural law than an empirical regularity that cannot be subsumed under more general laws or theories.
结构分析：句子的框架是a regularity…will be more readily called a natural law than an empirical regularity…。介词for加关系代词which引导定语从句修饰a regularity。an empirical regularity后又有定语从句that cannot be subsumed under more general laws or theories修饰。grounds意为“根据，理由”;subsume意为“把…归入，纳入”。
译文：因此，与一条不能被归入更普遍的法则或理论而是基于经验的规律相比，一条具有普遍理论依据支持的规律很可能被认可为一条自然法则。
17. It is because of the close association in most people’s minds of tools with man that special attention has always been focused upon any animal able to use an object as a tool，but it is important to realize that this ability，on its own，does not necessarily indicate any special intelligence in the creature concerned.
结构分析:句子的框架是It is because of…that…，but it is important to realize that…。but连接两个并列句，but前的并列分句为It is…that…强调结构，强调because of引导的状语。but后的并列分句又有that引导的宾语从句做realize的宾语。the close association in most people’s minds of tools with man中注意in most people’s minds把the close association of tools with man（工具与人类的密切联系）分隔开来。两个并列句中分别有able to use an object as a tool和concerned分别做其前面名词animal和the creature的后置定语。man根据上下文在此处指“人类”，而不是“男人”;not necessarily译为“不一定、未必”;on its own意为“独立地，凭自己力量”，在此转译为“就其自身而言”。
译文： 正是由于在大多数人头脑中工具与人类联系密切，人类才特别关注有能力把物体当工具使用的任何一种动物。但值得注意的是，这种能力就其自身而言，并不表明这种动物有什么特别的智慧。
18. The point at which tool using and t
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