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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Whatever the source of noise, one thing is certain: Silence, it seems, has become a golden memory.

无论何种噪声源，有一点是肯定的：宁静似乎已成为金色的回忆了。

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The noise pollutionsurvey revealed a rather spurring 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发笑的老式噪音源。

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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

On televisions, this is achieved via a small set-top box -- a prototype of which approaches the size and noise level of a mini-fridge -- that plugs into the video source and the TV and converts the video in real-time with virtually no latency.

ENGADGET: Switched On: The old adventures of new 3D