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托福听力必备背景知识：噪音影响

2015-04-21 11:04:39来源：网络

　　托福听力考试中常常会遇到关于噪音的背景资料。了解一些相关知识有助于更好的理解和做题。新东方在线为大家带来托福听力必备背景知识：噪音影响，希望对大家托福备考有所帮助，更多精彩尽请关注新东方在线托福网!

　　生活段子：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

　　查看全部托福听力必备背景知识大全

本文关键字: 托福听力 托福听力背景知识 噪音

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