Beneath the soil lies a layer of bedrock.

土壤下面有一层基岩。

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This seam of coal reposes on a layer of clay.

这个煤层处于一层黏土岩之上。

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The Maya poured the chocolate drink back and forth between two containers so that the liquid had a layer of bubbles,or foam.

VOA: special.2010.02.17

If this is the particular kind of axon that is 'myelinated', then it might have a layer of a special substance called myelin in sheathing the axon.

假设这是一种特殊的有髓鞘的轴突,它表面上会像鞘一样地包裹上一层,称为鞘磷脂的特殊物质

耶鲁公开课 - 生物医学工程探索课程节选

But I'm sure you can easily see how these styrofoam balls could, in fact, be a mono layer of gold nuclei.

这个实验怎么工作的,我们先来做些计算，但我相信你们都已经。

麻省理工公开课 - 化学原理课程节选

This flexible demand adds a layer of complexity as to how brands deliver their messages.

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The reality is that partnership adds a layer of frailty to your business venture.

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Then, quite suddenly, 65m years ago, a layer of lava nearly 2km thick appears.

ECONOMIST: Mass extinctions