人类正常的生活离不开自然交织的各种和谐的音响。但是,随着现代工业、城市建设、交通运输的急剧发展,噪音污染已成为仅次于大气污染、水质污染的又一大公害。国际统一的声强单位是“分贝”,即十分之一的贝尔(在电学和声学中计量功率的一种单位,它是为了纪念美国著名科学家、电话的发明者贝尔而命名的)。一个合适环境的音响分贝数是既不低于15分贝尔也不超过35分贝。秋风习习 The normal life of human beings is inseparable from the natural harmony of a variety of audio. However, with the rapid development of modern industry, urban construction and transportation, noise pollution has become another major public hazard next to air pollution and water pollution. The internationally harmonized unit of sound power is “decibel”, one tenth of the bell (a unit of measurement of electricity in electricity and acoustics, named after Bell, the famous American scientist and telephone inventor). The acoustic decibel for a suitable environment is neither lower than 15 dB nor higher than 35 dB. Autumn breeze