当然还有牛的肠胃气涨：当牛消化草或谷物时，每天产生超过200升的甲烷气体。

And of course, there is cow flatulence: as cattle digest grass or grain, they produce methane gas, of which they expel up to 200 L a day.

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气举采油是世界上使用最为广泛的人工举升方式之一。

Gas lift is one of the most widely used artificial lift methods in the world.

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同样，压缩天然气给大致相同的里程每升的燃料，但成本只有大约半数的普通汽油的价格。

Similarly, compressed natural gas gives roughly the same mileage per litre of fuel, but costs only about half the price of regular gasoline.

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