只用一本书提高英语听力能力!重温经典名著双语阅读小编推荐:跟着纪录片学英语不背单词和语法,轻松学英语
返回列表 回复 发帖

[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!
hw
A story affecting every American family, here is the question. Are your earphones ruining your hearing, right now, tonight? Are millions and millions of Americans walking around listening to music but ensuring, they will not 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 chief medical editor doctor XXX is stepping in.
Thirty years ago the people in their 20’s could all hear the rustle of leaves, the drip of rain drops, the babble of children. Now for 1 in 5 of them, the sounds are gone, forever.
Normally people are coming in in their 40’s and 50’s with hearing loss, now that has shifted into people in their 30’s and 40’s.
In fact doc XXX has to tell more and more teens their high-pitch hearing has already gone. Design our headphones are big business, high ticket must-haves. But for hearing loss, earbuds maybe the most destructive, some context: music devices can produce about 115 decibels of sound, earbuds at 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. Coming 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 are fragile hear cells. They turn the vibration into sound messages to the brain, blast them with loud sound and some wither. If the loud sound is brief, they will recover, but if it’s 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 1 hour a day. My advice: never go higher than 3 quarters of your top volume, and a couple of hours is enough.
返回列表