Wherever these particles settled, they formed a pan, a layer that water couldn't penetrate.

不管这些粒子沉降在哪里，它们会形成一个平面板块，一层水无法渗透的平面。

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The explosion lifted about 100 trillion tons of dust into the atmosphere, as can be determined by measuring the thickness of the sediment layer formed when this dust settled to the surface.

这次爆炸将大约100万亿吨的尘埃提升到大气中，这一数字可以通过测量这些尘埃降落到地表时所形成的沉积层的厚度来确定。

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Sediment cores are essentially a record of sediments that settled at the sea floor, layer by layer, and they record the conditions of the ocean system during the time they settled.

沉积物岩心主要记录的是沉淀在海底沉积物，一层又一层，记录它们沉淀时的海洋系统状况。

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The Veterans Affairs Department, perhaps the largest federal agency to make a big push for mobile devices, has settled on security at the application layer, a course that the largest potential federal buyer, the Defense Department, is unlikely to copy.

FORBES: Obama's War On Wasteful Mobile Devices

The whole house had a layer of fine dust that had settled on all the surfaces.

CNN: E-mail from an inferno: Taking back our house