The noise pollution survey revealed a rather surprising and possibly amusing old fashioned source of noise.

这个有关噪音的污染调查还揭示了一种出人意外而同时可能会引人意外而同时可能会引人发笑的老式噪音源。

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As well as the noise, traffic, loss of arable land and threat to birds, airports are a major source of pollution and greenhouse gas emissions.

机场不仅导致了噪声、交通堵塞、耕地流失，威胁鸟类，还是主要的污染源和温室气体排放源。

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Noise from transportation is one major source of noise pollution.

交通噪音是噪音污染的主要来源。

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Mr. Bahtiarian says the main source of noise pollution is the propeller.

VOA: special.2011.06.29

What was once considered noise pollution could soon become a green source of energy.

FORBES: Written by Bryan Nelson