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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The photographs actually show sand dunes coated with a thin layer of frozen carbon dioxide, or dry ice, less than 240 miles from the planet's north pole.

这张图片实际显示的，是距离火星北极不足240英里的沙丘上覆盖的一层薄薄的冰冻二氧化碳、或干冰。

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Concrete shape after a few days, the surface is a thin layer of massive fall off, tight get peeling bottom often have "rise sand" phenomenon.

混凝土成型几天后，表面薄薄的一层呈块状脱落，紧挨脱皮的底层通常还会有“起砂”的现象。

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After the dunes are reshaped, the topsoil is spread over the bare sand in a thin layer, triggering the natural processes that facilitate the recovery of the dunes.

CNN: South Africa dune mining whips up sandstorm