The problem is that it still has to be transported by trucks or rail because they haven't built any pipelines to move it.

问题是，它仍然需要通过卡车或铁路运输，因为他们没有建造任何管道来运输它。

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And because it is the main ingredient in natural gas, it leaks from many older natural-gas pipelines.

而且因为甲烷是天然气的主要成分，它通过许多老式的天然气管道泄露。

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Hydrates occur naturally in pipelines, and are unpopular because they clog the flow of oil.

水合物可以在输油管道中自然形成，因为它们阻碍石油的流动，因而不受欢迎。

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Projects to build Gazprom pipelines to China have been delayed because of disagreements over gas pricing.

VOA: standard.2009.10.13

Like a once-quiet neighborhood cut up by an expressway and laced with off ramps, northeastern forests are changing because of the pipelines crisscrossing them amid the region's gas drilling boom, experts say.

WSJ: Northeast drilling boom threatens forest wildlife

Moving the finished ethanol around the country would be challenging, too, because ethanol corrodes today's pipelines.

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Natural-gas pipelines cannot be used because hydrogen makes the steel tubing brittle and attacks the welds.

ECONOMIST: Tech.view