The paper studied the bottom structure of two classical two combination gas lift systems and compared the merits & demerits of them.

本文分析了两种典型的组合举升系统井下结构及其优缺点。

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From the drill holes, it is found that most area of the county belongs to Tertiary system stratum of integrity, which is the perspective stratum of containing combination gas.

本县境内大部分地区钻孔内部钻遇比较完整的第三系地层，是含油气的远景层区。

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A spokesman for National Grid said: "We provide the expertise in the transportation of carbon dioxide gas through a combination of new and existing pipelines."

一名英国国家电力供应公司发言人说：“在使用已有的管道和新管道联合运输二氧化碳时，我们进行了专家评估。”

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The repair shop put an engine on a test bed, attached sensors, hooked it to computers, and tried every possible combination of gas and air.

FORBES: Institutional Stupidity, III

"a vast number of on-road 18-wheeler tractor-trailer trucks hauling coal" in the Appalachian region of Kentucky and West Virginia could be converted to combination diesel-natural gas engines with the GFS system.

FORBES: Charles Koch

Muller , also said that "a vast number of on-road 18-wheeler tractor-trailer trucks hauling coal" in the Appalachian region of Kentucky and West Virginia could be converted to combination diesel-natural gas engines with the GFS system.

FORBES: Charles Koch