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。
2
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。
3
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.