Noise pollutionThe sound is caused by vibration of the sound object that we heard. Today. There are various levels of sound power. Some of the sound, enjoying happy Some people with passion, such as music, audio, sound in the wind. Although the specification of the lovers gift please appeal to the side of the ear. The sound occurs, causing noise in various hotel levels, high levels are harmful to health.A major source of sound, and is often unavoidable. Activities relating to the daily life of human beings.
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