考古层次包含了从现有地下层面的两个主要延伸。

The archaeological level consists of two main extensions from the existing subterranean level.

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文章首句指出：“由于‘地震反射法’(sr)在勾划地球的地下层面这方面的准确性，该方法一直是探寻石油储备的最重要的工具。” 这是一个判断句，为结论。

Because of its accuracy in outlining the Earth's subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves.

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第二句话对解释进行总的说明：“在实地作业中，通过将一系列波列源，诸如小规模炸药爆炸，排列成一个网格模式，从而将地下层面标绘出来。” 接下来是“地震反射法”的详细过程。

In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern…

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But after this umbrella level of equality come different types of people, and those different types of people are going to require different levels of rights. Gender, absolutely.

不过在这个平等的层面下,会有各类人等，这些形形色色的人会要求,不同层次的权利，性别肯定。

普林斯顿公开课 - 人性课程节选

So, all of that is very palpable, and Sal's own desire for Dean is sublimated in those scenes, but it's everywhere at the level of the language.

所有这些都很明显，在那些情景下Sal对迪恩的渴望升华了，但在语言层面上到处都有表现。

耶鲁公开课 - 1945年后的美国小说课程节选