This gas is hydrogen sulfide, rises up and mixes with oxygen in the underground water that sits in the cracks and fissures in the limestone.

这种气体是硫化氢，上升后与石灰岩裂缝中地下水的氧气混合。

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When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it.

当井和一个水池相接时，油通常会从井里上升，因为它与井下的水的密度不同，或者因为停留在它上方的膨胀气体的压力。

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And then he rises up.

然后他站了起来。

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It rises up a row. It decreases down the column.

在行内逐次增加，在列内逐次递减。

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