Its powerful electric starter motor as well as low-noise, enhanced meshing mechanics guarantee safe, fast, and quiet engine starts in all situations.

其强大的电起动马达以及低噪音，增强啮合力学保证安全，快速，安静的发动机在所有情况下启动。

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The problem isn't the engine itself; that is actually relatively quiet. It's the rotors that make the classic "whup-whup" sound.

问题不在于相对来说更安静的发动机，而在于发出经典的“呼呼”声的旋翼。

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Person pork engine let this cleaner while MM has his moment quickly, the life that also lets her becomes not quiet, she begins to beg people to let off her now.

人肉引擎让这个清洁工MM迅速走红的同时，也让她的生活变得不平静，她现在开始求人们放过她。

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You don't get the usual rumbling of an idling engine, just the whisper-quiet whirl of the e-tron's motor (Audi is currently engineering an "e-tron sound" so that outsiders will be able to hear the car) and wind whizzing by.

ENGADGET: Audi A3 e-tron hands-on (video) Hands-on

And with no engine noise, the Model S rolls with a quiet coolness.

WSJ: Tesla Takes Luxurious Route to the Electric Car

Two-and-half-hour stints are a breeze, thanks to the surprising suppleness of the suspension, potent engine, smooth-shifting seven-speed automatic transmission and quiet interior.

FORBES: Test Drive: 2013 Mercedes-Benz C300 4Matic Has Seductive Power