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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The rock cutting techniques under deep water of practical application should consider the relations between cutting times, jet horizontally moving velocity and efficiency.

在深水环境条件下岩石切割技术的生产实际应用中，要综合考虑切割次数和射流横移速度与效率的关系；

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The hydraulics and abrasive parameters of premixing jet has great effect on casing cutting efficiency.

水力参数和磨料参数对前混式磨料射流切割套管的效率有着极重要的影响。

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He's betting there will be increasing demand for things like high-efficiency jet engines and locomotives that go farther on a gallon of diesel.

FORBES: On The Cover/Top Stories

The recent availability of Wi-Fi systems and the ability to conduct face-to-face meetings en route further increases the efficiency of a private jet.

FORBES: Private Jets: Efficiency Tools, Not Posh Luxuries

The labor- and money-saving efficiency of a private jet makes the decision to own and operate one similar to deciding to buy a new CNC machine or an integrated computer system.

FORBES: Private Jets: Efficiency Tools, Not Posh Luxuries