In the aftermath of a massive bloom, dead phytoplankton sink to the ocean or lake floor.

在一场大规模水华后，死亡的浮游植物沉入海底或湖底。

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Once the probe has been hauled up, a coring device will be lowered down the borehole to take samples of the lake floor sediment.

探头拖上来后，会把一个除芯机放到钻孔里，采集湖底淤积物的样本。

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It optimises the chances of recovering an undisturbed, continuous sedimentary sequence from the lake floor and minimises the potential for trapped gases to gain entry to the borehole.

它优化了从湖底稳定取样、并保证从湖底沉积层取样的连续性，并最小程度上减小了冒气对钻孔的破坏。

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The mantle beneath rose some 200 million years ago, resulting in the elevation of the lake floor.

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Offshore production means any platform structure that is affixed temporarily or permanently to offshore submerged lands and that houses equipment to extract petroleum and natural gas from the ocean or lake floor.

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On the valley floor stands the frozen lake of St Moritz -- home to an unlikely event of similar vintage -- "White Turf" -- horse racing on snow and ice.

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