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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When the Nile is in flood, it deposits a layer of mud on the fields.

尼罗河泛滥时，在田野上沉积下一层泥。

《新英汉大辞典》

The lipids will form a bi-layer where the water soluble part of the lipid points out of this layer and the oily part points in.

脂质会形成双层膜,水溶性部分朝向膜层外,而脂溶性的部分朝向双层膜内部

耶鲁公开课 - 生物医学工程探索课程节选

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