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[万花筒] 【整理】2013-03-15&03-17 高分贝耳机——听力杀手

提高英语听力能力 找对方法很重要!

[Homework]【整理】2013-03-15&03-17 高分贝耳机——听力杀手

A story affecting every American family. Here's the question. Are your earphones ruininng your hearing. Right now, tonight, are millions and millions of Americans walking around, listening to music. But ensuring they will not be able to hear as well in the years ahead. Tonight the mayor of New York says it's time to send out an alarm. And ABC's chief medical editor Dr. Richard E. Besser is stepping in.
Thirty years ago, people in their Twenty's could all hear the rustle of the leave, the drip of raindrop, the dabble of children. Now, for one in five of them, the sounds have gone, forever. Normally, people were coming in their fifties and sixties with hearing loss. And now that has shifted into people in their thirties and forties. In fact, Dr. George Alexiades has to tell more and more teens, their high-pitched hearing is already gone. Designer headphones are big business, high-ticket must-haves. But for hearing loss, earbuds maybe the most destructive. Some context. Music devices can produce about one hundred and fifteen decibels of sound, earbuds at five decibels more. Eighty-five decibels is where hearing damage starts. Power tools, ninety eight decibels. A lawn mower, one hundred and seven. A jet taking off 100 feet away, one hundred forty. So how loud is the music? I went out with a decibel meter Coming in about 95, 105. Wow, a hundred nine Here's what happened inside your ear. When strong sound vibrations hit your ear, the problem deep inside the cochlea are fragile hear cells. They turn vibration into sound messages to the brain. Blast the more loud sounds, some wither. If loud sound is brief, they will recover. But if it lasts too long or happens too often, they die and they'll never grow back. If you get to a hundred decibels, I would limit that to about one hour a day My advice? never go higher than three quarters of your top buying. And a couple of hours is enough.
                                                   
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