NOx is produced when the nitrogen from the air reacts with oxygen under high engine temperature and pressure conditions.

在高温高压下，空气与氧气反应，产生了氮氧化物。

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The system uses the engine to drive a hydraulic pump that charges an accumulator to high pressure.

这种系统利用该发动机来驱动液压泵以使蓄压器充满压力达到高压。

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That's one reason why gas turbines work so well in aircraft; other than taxing, landing, or taking off, the engine runs at high pressure, high power and high temperature.

燃气轮机在航空作业中处于高温高压和高能的状态下，其性能远远优异于滑行，着陆和起飞阶段。

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The XOS 2 is nearly usable for the latter job, but even at 50 percent more efficient than the original (by the company's last count) it's still a prototype that requires a tethered high-pressure hydraulic engine to function.

ENGADGET: Raytheon's Sarcos XOS 2 military exoskeleton just does the heavy lifting -- for now

The combination of turbocharging and high-pressure direct injection allows Ford to substitute a smaller engine for a bigger one.

FORBES: Los Angeles Auto Show: Ford Fiesta Rolls Out A Three-Cylinder Engine For 2013

Baidu has faced growing competition in its core search business from Qihoo, putting pressure the profitability of its once high-flying main profit engine.

FORBES: China Internet Consolidation Gets A New Push As Baidu Buys Online Video Vendor PPS