The rapid expansion of gas output has not been painless.

天然气产量的快速扩张并不是没有痛楚的。

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By the end of the year, production from D-6 is expected to have doubled the country's gas output.

预计到今年年底，D - 6的油气生产量将是全国天然气产量的两倍。

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Production has soared twelvefold since 2000, to 4.9 trillion cubic feet, or a quarter of the country's total gas output.

从2000年开始，美国的页岩天然气产量已经激增了十二倍，达到了4.9万亿立方英尺，大约占全国天然气总产量的四分之一。

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Daily gas output has surged to a record 79 billion cubic feet a day.

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The second factor is the explosion in gas output in the U.S. caused by the shale gas boom.

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The state oil company lacks the means, and multinationals the will, to invest much in expanding natural-gas output.

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