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托福听力素材:噪音影响

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2017-12-20 21:28

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【 liuxue86.com - 托福听力 】

  托福听力是考试难点,那么好的听力资料有哪些呢?想必是出国人士比较关心的问题,和出国留学网托福栏目小编一起来了解了解托福听力素材:噪音影响,欢迎阅读。

  托福听力素材:噪音影响

  I'm grad to see so many of you here. We've become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss. First, I want to go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. Sounds up to 80 decibels generally aren't harmful. That's noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. Once you are up to around 140 decibels, that's like a jet plane taking off, then you might even feel pain in your ears. And pains are sure sign that your hearing's at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let's try to generate a list of damaging noises.

  我很高兴在这里见到你们中的许多人。我们已经对健康中心感到震惊了,因为我们看到的学生人数,他们正在经历听力损失。首先,我想介绍一些关于听力的基本知识。然后我们可以看看我们的学校环境,看看我们是否能找出一些保护听力的方法。可预防听力损失的主要原因是过度的噪音。长时间的适度噪音或某些类型的强烈噪声,即使短时间也会损害听力。响度是用分贝来衡量的。一个分贝是普通人能听到的最低音。声音高达80分贝通常是无害的。这就像繁忙街道上的交通噪音。但是,任何高于80分贝的声音,尤其是持续暴露的声音,最终都会伤害到你的听力。一旦你达到140分贝,那就像喷气式飞机起飞一样,你甚至可能会感到耳朵疼痛。疼痛是你的听力有危险的信号。即使是在近距离的噪音下,也会引起听力损失。所以你需要做的是限制你暴露在有害的水平。如果你通过这份材料,我们可以看看一些普通校园声音的分贝等级。注意人们在看足球比赛时那些角有多响。如果你被吹到后面,那就太危险了。现在,让我们试着生成一串有害的声音。

  想了解更多托福听力网的资讯,请访问: 托福听力

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