Noise-- man's killer
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大杂烩---
People don't want to hear any sound, or noise, such as that produced by airplanes, traffic, or industrial machinery, is considered a form of pollution. Noise pollution is at its worst in densely populated areas. It can cause hearing loss, stress, high blood pressure, sleep loss, distraction, and lost productivity.Sounds are produced by objects that vibrate at a rate that the ear can detect. This r...
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2008