荷兰皇家壳牌公司继续在北美致密天然气蕴藏资源中取得领先优势，在马塞卢斯和伊格福特区的油气成藏组合中新增高储量油气层。

Royal Dutch Shell plc (“Shell”) continues to build a leading portfolio in North America tight gas, with new positions in high potential US shale gas acreage, in the Marcellus and Eagle Ford plays.

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一方面，公共事业团体大多有富余的燃料，所以他们能（在缺少天然气的条件下）调整自己的燃料组合，但司机却不能在缺油的情形下自我调节。

For one thing, utilities mostly have spare capacity and can thus adjust their fuel mix in a way that car drivers confronted with an oil shortage cannot.

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此外还有以上几种驱动方式的组合，如气-电动阀等。

In addition, there are several drivers for more than a combination of methods, such as gas - electric valve.

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