I really admire the efficiency of your secretaries.

我真佩服你们秘书的办事效率。

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Liberals say the fuel-efficiency requirements for the replacement vehicles are not strong enough for the environment.

VOA: special.2009.08.07

And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.

在实际中，我们定义,效率为热与功的比值。

麻省理工公开课 - 热力学与动力学课程节选

As long as it's reversible, you know what the efficiency has to be, and in principle, you could break it down into a bunch of steps that you could formulate as isothermal and adiabatic.

只要这个循环过程是可逆的，你们知道效率是多少，从理论上说，可以将总过程,分解成一系列绝热,和等温的小过程。

麻省理工公开课 - 热力学与动力学课程节选

He raises doubts about the efficiency of human power and questioned its economic viability.

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

Imagine the efficiency gains if the ethanol produced in Iowa was consumed in Iowa.

FORBES: The Midwest Should Use Its Own Ethanol

Most owners already have tried to boost the efficiency of their stations by installing self-serve pumps.

WSJ: Pain at Pump Hits Gas-Station Owners