Noise is considered as one of the four major pollutants nowadays . It cannot be seen or touched or smelled or tasted , so its harmful influence on beings can only be felt . What’s more , noise does not hurt beings’ bodies directly , but can ruin one by damaging one’s spirit continuely or strongly . Thus noise is a real stealthy killer .
When one talks about noise ,’decibel’ is usually used. A decibel (db) is a unit of measurement which describes how loud a sound is . Generally speaking , the noise is about 70 dbs in a crowdy street , 90 dbs in a workshop ,and 115dbs from a plane . Tests indicate that noise over 115 dbs can seriously weaken the function of cerebral cortex（大脑皮层） that noise reaching 165 dbs can cause animals’ deaths , and that noise over 175 dbs can kill human beings .
Noise is so terrible that it once has been used as a cruellest penalty during the World War Ⅱ. The strengthening noise coming from the tweeters was not stopped by the Nazisms , until the prisoners screamed crazily , with their eye conjunctivas （眼结膜）congested , and then managed to smash the bonds in order to kill themselves by hitting the wall.
comic strip from 21stcentury
Jokes from Chinadaily>Language Tips>Daily joke
When one talks about noise ,’decibel’ is usually used. A decibel (db) is a unit of measurement which describes how loud a sound is . Generally speaking , the noise is about 70 dbs in a crowdy street , 90 dbs in a workshop ,and 115dbs from a plane . Tests indicate that noise over 115 dbs can seriously weaken the function of cerebral cortex（大脑皮层） that noise reaching 165 dbs can cause animals’ deaths , and that noise over 175 dbs can kill human beings .
Noise is so terrible that it once has been used as a cruellest penalty during the World War Ⅱ. The strengthening noise coming from the tweeters was not stopped by the Nazisms , until the prisoners screamed crazily , with their eye conjunctivas （眼结膜）congested , and then managed to smash the bonds in order to kill themselves by hitting the wall.
comic strip from 21stcentury
Jokes from Chinadaily>Language Tips>Daily joke
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