 
- UID
- 3135490
- 帖子
- 166
- 贡献值
- 163
- 普币
- 0
- 听力指数
- 204
- 阅读权限
- 70
- 在线时间
- 135 小时
- 注册时间
- 2011-9-20
- 最后登录
- 2014-11-7
|
17#
发表于 2013-3-18 21:15
| 只看该作者
[Homework]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 ear phone wounding your hearing? Right now tonight are millions and millions of Americans walking around listenting to music, but ensuring they will not be able to hear as well in the year ahead. Tonight the mayor of New York says it's time to send out an alarm, and ABC's chief medical editor Dr. Richard Basser is stepping in.
Thirty years ago, people in their twenties could all hear the rustle of leaves, the drip of raindrop, the babble of children. Now for one in five of them, those sounds are gone forever.
Normally, people will come in their fifties and sixties with hearing loss, and now that has shifted into people in their thirties and forties.
In fact, Dr. George // has to tell more and more teens their high-piched hearing is already gone. Designing head phones are busy business, high ticket must has, but for hearing loss, ear buds may be the most destructive. Some context, music devices can produce about 115 decibles of sound, ear buds at 5 decibles more, 85 decibles where hearing damage starts. Power tools 95 decibles, a lawn mower 107, a jet taking off 100 feet away 140. So how loud is the music? I went out with decible meter.
Coming in about 95. Oh, 105. Oh, 109. Here is what happens inside your ear. When strong sound viberation hit your ear, the problem inside the cochlea are fragile your hear cells. They turn viberaion into sound message to the brain. Blast them with loud sound some whether. The loud sound is brief, they recover, but if it lasts too long or happen too often, they die and they never grow back.
If you get to 100 decibles, I would limit that to about 1 hour a day.
My advice: never go higher than three quaters of your top buying, and a couple of hours is enough.
This post was generated by put listening repetition system, Check the original dictation thread! |
|