第三部分主要探讨生态旅游与社区参与的本质关系。

The third part mainly explores the essential relationship between ecotourism and community participation.

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数学模型用来反映过程本身各有关变量之间本质关系，它可能是代数方程、微分方程或几何曲线。

The math model is used to image the essential relation of every variable in the process, maybe the model is algebra equation, or differential equation, or geometry curve.

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人与自然的关系包括人与自然的本质关系、价值关系、历史关系等多重含义，这些关系是在人的实践活动中产生和形成的。

The relationship between man and nature includes the essential relation, the valuable relation and the historical relation, which come from man's practice.

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And all this is, is saying that when you take a mixed second derivative, it doesn't matter in which order you take the two derivatives.

麦克斯韦关系的本质是,当你考虑混合的二阶导数时，求导的顺序不影响最后的结果,现在，我们利用这些关系。

麻省理工公开课 - 热力学与动力学课程节选

I look at something and I know what it is, forgetting that possibly I only know what it is because of a context in which indeed it is not those other things that are linked to it.

而我认知一样东西，很可能并不知道它的本质是什么,而是以它和其他事物的,关系来认知它。

耶鲁公开课 - 文学理论导论课程节选

This raises a question. Whether the relation between contemporary political science and liberalism is merely accidental or whether there is some intrinsic some necessary connection between them.

这导出一个问题，当代政治科学,与自由主义的关系仅是偶然,或之间，有些本质的,一些必然的,连结介于两者之间。

耶鲁公开课 - 政治哲学导论课程节选