Backup power could also be provided by linking wind farms with a solar cell, with conventional or pumped-storage hydropower, or with efficient natural-gas-burning turbines.

将风力发电厂与太阳能电池、常规或抽水蓄能的水电或高效的天然气涡轮机连接起来，也可以提供备用电力。

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The maximum modulation depth of the gas cell is calculated as 42%, which is in good agreement with the experimental result.

计算了气体盒的最大调制度，其值为42%，与实验所得到的最大调制度很好地符合。

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The mutual influence between different microwave transitions in optical pumping experiment is observed. The possibility of applying the Optical-microwave pumping device in gas cell is discussed.

本文观测了光抽运实验中不同频率的微波跃迁之间的相互影响，并讨论了光——微波抽运方案用在气泡中的可能性。

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Natural gas powers the four-fuel-cell system, each cell capable of producing 200 kilowatts of electricity.

CNN: Fuel cell power helps bank make money

Also a type of electric vehicle, a fuel-cell car takes hydrogen gas and converts it into electricity, while emitting only water vapor.

CNN: Hydrogen fuel-cell cars look to overtake electric autos

Some even dream of using natural gas to make hydrogen which would power fuel-cell cars, though advocates admit that these are still a long way off.

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