Only when a system possesses natural or artificial boundariesthat associate the water within it with the hydrologic cycle may theentire system properly be termed hydrogeologic.

只有当某一地质系统拥有自然的或人工的界限，将该系统内的水与水文循环起来，这整个系统方能被恰当地称为与水文地质学相关。

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The efficiency of a coal-fired thermal plant is typically in the range of 30%-35%. In a combined cycle gas turbine system running on natural gas, the maximum efficiency is in the range 45%-50%.

烧煤的热电厂的效率通常在30%到50%之间，使用天然气的联合循环燃气轮机系统最大效率在45%到50%之间，而很多专家认为高温燃料电池的效率可达到80%至85%。

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Take the natural gas booster station built in 9e class gas turbine combination cycle power plant for example, its function and system constitution were introduced and analyzed.

以9e级燃机联合循环电厂所配置的增压的天然气调压站为例，介绍和分析其功能和系统组成，为国内同类项目的建设提供参考。

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But natural gas combined cycle is not a system of emission reduction.

FORBES: Why You Should Care That Courts Overturn EPA's Carbon Pollution Standard

The EPA is saying with a straight face that natural gas combined cycle is an emission reduction system that has been adequately demonstrated for coal power plants.

FORBES: Why You Should Care That Courts Overturn EPA's Carbon Pollution Standard