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.
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.
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…
阶级层面的“下层”与“上层”的对立。
主地毯中上层面料材料、下层材料的面密度、前端涂层及装配工艺对地毯的吸音性能具有较大的影响；
The cover material of floor carpet, the substrate mass, the front heavy layer as well as the assembly process affect greatly on the carpet absorption performance.
主地毯中上层面料材料、下层材料的面密度、前端涂层及装配工艺对地毯的吸音性能具有较大的影响；
The cover material of floor carpet, the substrate mass, the front heavy layer as well as the assembly process affect greatly on the carpet absorption performance.
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