This method provided a readout for how home energy use has evolved since the early 1990s.

这种方法向我们展示了自20世纪90年代初以来家庭能源使用情况的演变数据。

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Another method is to "harvest" energy from the environment, converting heat, light or vibrations that occur naturally.

另外一种方法就是通过转化周围环境中自然形成的热，光和振动来产生能量。

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The researchers have devised a method that allows the generation of energy by converting low-frequency vibrations from body movement, heartbeat, blood flow, and the wind into electricity.

这项研究成果可以将人体移动，心跳，血流等低频振动转化为电能。

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Bernard Bilski and Rand Warsaw wanted to patent a method to let traders protect against the risk of price changes in energy markets.

VOA: special.2010.07.16

But the commission also emphasized that the state's own method of energy deregulation set the stage for the traders' abuse.

FORBES: In California Energy Crisis, Some Dogs Still Bark

Italian inventor Lucien Gambarota, who designed California Fitness's method of storing energy and using it to power lights and music in the gym, told CNN the concept is straightforward.

CNN: Are we heading for a human-powered future?

Crucially, it is an effective method of producing energy.

BBC: Time to encourage biomass growth