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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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It USES a thin stream of falling sand to measure time.
它使用一小股落下的沙子来计算时间。
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It USES a thin stream of falling sand to measure time.
它使用一小股落下的沙子来计算时间。
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