此外，由于引擎（发动机）外部运动较慢的空气覆盖了高温燃气排出引擎后部时的噪音，“高旁道比”（高涵道比）飞机的噪音指数下降了80%左右。

They are also some 80% quieter because the mass of slower-moving air shrouds the noisy hot gases coming from the rear of the jet.

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但最近的调查表示，噪音可能更具危险性，它使压力指数和患病的风险大为提高——“噪音”这个词源自于拉丁语，原意是作呕。

But recent studies suggest that noise could even be dangerous, increasing stress levels and risk of illness - the word "noise" does derive from the Latin "nausea" after all.

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