他定期从三种深度收集土壤样本，分析其中的有机碳。
He periodically collects soil samples at three depths and analyzes them for organic carbon.
尽管最近获取的岩浆样本表明它源于距离地表七十多公里的地幔层，但科学家们依然不确定熔岩湖的深度。
Scientists aren't sure of the lake's depth, though recent lava samples indicate the magma originated in the Earth's mantle more than 46 miles below.
地球号考察船已经能够取出海床以下2 890英尺深处的样本，这个深度是任何其他钻机的二到四倍。
Already, the Chikyu research vessel is capable of fetching samples at depths of 2, 890 feet below the seabed, two to four times that of any other drill.
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