We know the sounds of cities are loud enough to cause great harm to people's hearing in the U.

S. One person out of twenty has got some hearing loss. And all over the world the situation is getting worse and worse all the time since the noise increases with the population.

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With the development of machines, noise has also increased greatly in the 20th century. We live surrounded by loud planes, trucks and electric tools. TV sets and radios add up to 90 or J00 decibels, a certain unit used to measure the loudness of sound. A normal dialogue reaches 55 decibels; a plane goes to 100, and an ordinary train, reaching the station, can be twice as loud as the loudest plane. Disco music reaches about 118. At 120 decibels the ear stops hearing sound, and pain starts.

How terrible if things go on like this!

我们知道城市的声音,响声足以对人们的听力造成巨大的伤害。

美国一个人从二十有一些听力损失。和世界各地的情况越来越糟了一直以来的噪音增加人口。

随着机器的发展,噪音也大大增加了在20世纪。我们生活周围大声飞机、卡车和电动工具。电视机和收音机加起来90或J00分贝,某单位用来测量声音的响度。一个正常的对话达到55分贝;100年一架飞机去,和一个普通的火车,到达车站,可以大声是最大的平面的两倍。迪斯科音乐达到约118。在120分贝耳停止听到声音,和痛苦的开始。

多么可怕如果事情这样!