It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing.

由于睡眠时呼吸道中的气流阻力更大，并且用于呼吸的肌肉效率有变化，所以在睡眠时呼吸需要用两倍的力气。

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A companion research effort looked at concepts for a new generation of supersonic transport aircraft capable of meeting NASA's noise, emissions and fuel efficiency goals for 2030.

一项合作研究成果着眼于新一代超音速运输飞行器的概念，以满足NASA为2030世代设定的噪音、排放和燃油效率目标。

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Over the length of the value chain, it's possible to look at the total effort in proportion to the elapsed time to give an understanding of efficiency.

对于价值链的长度，您可以查看总体工作量与消耗时间之间的比例，以理解效率。

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As part of its Digital Service Efficiency effort to reduce power consumption in its data centers, eBay slightly changed some of its software code so that the code would require less memory.

FORBES: EBay's MPG For Data Centers

It has also been implementing an efficiency initiative, Project Keystone, a global effort to enhance the competitiveness and efficiency of Heinz to better leverage its scale.

FORBES: Heinz Will Catch Up To $62 As Emerging Markets Get Sauced

Boeing actually offered the Army options for scaling back features a year ago that were rebuffed, but with the budgetary walls closing in the service is now moving out on a series of efficiency measures that could unravel the whole effort.

FORBES: New Radio Could Revolutionize Combat for U.S. Forces