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发表于 2013-3-16 15:11
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[Homework]2013-03-15&03-17 高分贝耳机——听力杀手
HOMEWORK
A story affecting every American family, here is the question, are your earphones ruining you 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, ABC's chief medical editor Dr Richard B is stepping in.
30 years ago people in their 20s could all hear the rustle of leaves, the drip of a raindrop, the babble of children, now for one in five of them, those sounds are gone for ever.
Normally people would come in in their 50s and 60s with hearing loss and now that have shifted into people in their 30s and 40s.
In fact doctor George has to tell more and more teens their high pitch hearing is already gone. Designer headphone is a big business, high ticket must have, but for hearing loss, earbuds maybe the most destructive some context, music devices can produce about 115 decibels of sound, earbuds add 5 decibels more, 85 decibels is where hearing damage starts, power tools 98 decibels, a lawn mower 107, a jet taking off 100 feet away 140, so how loud is the music? i went out with a decibel meter.
Come in about 95, 105, 109.
Here is what happens inside your ear, when strong sound vibration hits your ear, the problem deep inside the cochlea, a fragile hear cells, they turn vibration into sound messages to the brain, blast them with loud sounds, some wither, if the loud sound is brief, they will recover, but if it last too long or happens too often, they die and they never grow back.
If you get to 100 decibels, i would limit that to about one hour a day.
My advice never go higher than 3/4 of your top buying, and a couple of hours is enough. Dr Richard B ABC news, New York.
This post was generated by put listening repetition system, Check the original dictation thread! |
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