要准确识别薄砂层，层位标定方法就尤为重要。
Reservoir calibration method is especially important for accurate identification of thin sand layer.
古河道砂层的存在，是影响围坝稳定的主要环境因素。
The sand stratum in old river bed is important factor affecting stability of dam.
煤层开采后，一些工作面出现了砂层水渗入井下的现象。
When the seam was extracted, water from the sand layer penetrated into some coal faces.
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