But when the tweakers took over the efficiency of the steam engine swiftly quadrupled.

但是当巧匠们接手之后，蒸汽机的效率一下子变成了四倍。

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The potential for increasing engine efficiency is substantial and even greater when coupled with advances in internal combustion engines.

这种引擎的效率还有很大的提升潜力，如果与内燃机配合使用其综合提升潜力将会更大。

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One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.

提高高旁通飞机引擎的方法之一就是把风扇变成开放式旋翼，有点回归于螺旋桨的味道，但要使用两圈粗短的反旋桨叶。

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So what this says is the efficiency of any reversible engine T1 has to be one minus T2 over T1.

这就是说,任何可逆热机的效率都是,负T2除以。

麻省理工公开课 - 热力学与动力学课程节选

So now let's look at the efficiency of our irreversible engine.

再来看看,不可逆热机的效率。

麻省理工公开课 - 热力学与动力学课程节选

Contributing factors in the VOC decline cited by the NOAA include catalytic converters, improved engine efficiency, and reformatted fuels that are less prove to evaporation.

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Excluding the engine, where efficiency will reach Italian levels only when a new engine plant is opened, it takes around 21 man-hours to build a Palio in Betim, or about two hours more than it would at Melfi, the firm's most modern Italian plant.

ECONOMIST: A car is born

But when the tweakers took over the efficiency of the steam engine swiftly quadrupled.

NEWYORKER: The Tweaker