Besides efficiency, durability and reliability, the most important requirement for solar cells was how much power they could generate per unit of weight.

它在除了功效、耐久性和可靠度之外，最重要的要求是电池每重量单元能产生多少功率。

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Officials claim the move will eventually have an impact on overall weight and fuel efficiency of the aircraft, although clearly the decision will also remove expensive printing costs.

新航有关管理人员表示此举既可减少昂贵的印刷费用，而且也可降低飞机整体载重和提高燃油效率。

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Spring tendons enhance the foot’s efficiency: some of the energy spent to drop one’s weight down when taking a step is actually stored and then returned to the leg as it rebounds.

人们走路每迈出一步，重量落下时所输出的一部分能量，事实上被脚弓存储起来，然后被脚弓弹起，这部分能量就又返回到腿部。

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The 4-Hour Body, Ferriss' treatise on using tracking to lose weight, maximize efficiency and "become superhuman, " shot to the top of the New York Times bestseller list in January.

FORBES: Magazine Article

Despite their safety risks, they are increasingly attractive to aircraft makers as a way to cut weight and thus improve fuel efficiency.

NPR: FAA Approves Resumption Of Boeing 787 Flights

Given today's materials and know-how, automotive engineers reckon a 10% reduction in vehicle weight yields a 6% improvement in efficiency.

ECONOMIST: Tech.view: Unbearable lightness? | The