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足球赛上球迷的狂呼乱叫声可以抵得上喷气式飞机起飞时的声音,会使某些人的听力受到终身损害——当然受害者不会是运动员了。许多球迷退场后都耳鸣不已,这就是耳朵疼痛的表示,久而久之,便会听不见声音了。这就是噪声造成的后果。噪声指人们不想听到的有害的声音,是当代社会的最大污染。噪声作为有力的机械能波进入我们的耳朵。科学家们以分贝(db)测量其强度。能量每翻一番,其强度就增加10分贝。日常的谈话声约为60分贝,小孩的尖叫约90分贝。在美国每天有五百万人在工作中要接触至少90分贝的噪声,按每天八小时计算,这是安全的最高极限了。但这个水平并不理想,因为每个人的承受
Crazy cries from football fans can be worth the sound of a jet as it takes off, causing lifelong damage to some people’s hearing - of course the victim will not be an athlete. Many fans tinnitus after the exit, which is the expression of ear pain, over time, they will not hear the sound. This is the consequence of noise. Noise refers to the harmful sound that people do not want to hear. It is the greatest pollution in contemporary society. Noise comes into our ears as a powerful mechanical energy wave. Scientists measure their intensity in decibels (db). Each doubling of energy, its intensity increased by 10 dB. The daily talk is about 60 decibels and the kids scream about 90 decibels. Every day in the United States, five million people are exposed to a noise of at least 90 dB at work, calculated as eight hours a day, which is the highest limit of safety. But this level is not ideal, because everyone’s bear