我对这些岩石感到惊奇，它们是经过几百万年的沉积而形成的，层次分明，当大峡谷从谷底开始渐渐沉人黑暗的时候，我发现岩石居然在变换颜色。

It was amazing the way the rocks, compressed into distinct layers over millions of years, changed colors as the canyon darkened from the bottom up.

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不过，这份文件中所有细节(包括近100页的脚注及数量众多的引证和支撑材料)层次分明、井然有序，所以对我们特别有帮助。

What makes the Report uniquely useful, though, is the level of detail (with nearly 100 pages in footnotes and untold amounts of exhibits and supporting materials) organized so well in one document.

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但是随着海水变暖，它的层次会更加分明，温度更高的海水会停留在表面，而这里正是生物体进行光合作用必需的地方。

As the ocean warms, it becomes more stratified, with the warmer water remaining at the top where the organisms need to be in order to do photosynthesis.

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