Apartfrom the hostile influence of man, the organic and inorganic world are, as Ihave remarked, bound together by such mutual relations and adaptations assecure, if not the absolute permanence and equilibrium of both, a longcontinuance of the established conditions of each at any given time and place,or at least, a very slow and gradual succession of changes in those conditions.
在其他网站看到的，我感觉他们的解答都不尽如人意。主如果secure是形容词还是动词？if not省略了什么？
本站大咖专家老师们如何看，谢谢！
根据传统语法，先行词为such修饰，后面的定语从句用as引导。
by such mutual relations and adaptations assecure, if not the absolute permanence and equilibrium of both, a longcontinuance of the established conditions of each at any given time and place,or at least, a very slow and gradual succession of changes in those conditions.
这部分整体是一个介词短语，是主句被动语态are boundtogether的施事者状语 (方法状语的一个细分类）。介词by之后为名词词组mutualrelations and adaptations，该名词词组被such限定，其后由as引导定语从句。as在从句中作主语，谓语动词secure 和第一个宾语a longcontinuance of the established conditions of each之间，插入了省略成分的修饰secure的让步状语从句 if notthe absolute permanence and equilibrium of both，if 意为尽管、即便，其后省略了主语和谓语动词, 补全这个让步从句则为 if they do not secure the absolute permanence and equilibrium of both。they指代as, =such mutual relations and adaptations。each为theorganic world and inorganic world 二者中的每个。at any given time and place为secure的地址和时间状语。
or at least, a very slow...到句末， 是secure的并列的宾语, 这部分你好像没疑问，我就不啰嗦了。
