Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface.

地质学家认为，这个具有流体化喷出物的陨石坑表明，在地表下几米深处有一层永久冻土层或水冰。

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The oil and gas in this region are under more than a mile of water and a thick layer of salt.

这个海域的油气埋藏在一英里多的水面下，还要打穿厚厚的盐层。

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The iPod touch does this using a layer of capacitive material under a protective covering.

iPod touch依靠位于保护膜之下的一层电容材料来达成上述功能。

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Under this layer of nanodiamonds, they found remains of many ancient animals, including those that disappeared after Younger Dryas.

VOA: special.2009.01.20

Temperatures as low as -23C (-9F) and heavy snowfall this month have left the capital Kiev and most of the country under a thick frozen layer.

BBC: Dozens die in Ukraine's cold snap