When the seam was extracted, water from the sand layer penetrated into some coal faces.

煤层开采后，一些工作面出现了砂层水渗入井下的现象。

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Reservoir calibration method is especially important for accurate identification of thin sand layer.

要准确识别薄砂层，层位标定方法就尤为重要。

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To achieve this at the Castellum, a 2 meters deep sand layer was used to compress and prepare the under-ground.

为了在城堡中达到这个标准，项目使用一个2米深的砂层来压缩和安排地下。

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Indeed, by taking several cores, progressively further from the coastal dune, and seeing how far a sand layer extends, he can make a good guess at how powerful a passing hurricane was.

ECONOMIST: Eye on the storm | The

It could be removed later by scraping up the top layer of sand.

ECONOMIST: A slick off America's coast

And a layer of sand at the bottom of my duffel bag.

WSJ: Ali Wentworth on a Solo Vacation to Turks and Caicos | Traveler's Tale