托福阅读背景材料：噪音对我们的影响

 　　下面给大家提供一篇关于生活中噪音的影响的托福阅读背景材料，希望能拓宽同学们的阅读面。

　　I'm grad to see so many of you here. We'vebecome really alarmed over the health center by thenumber of students we are seeing， who areexperiencing hearing loss. First， I want to go oversome basic about hearing. Then we can take a look atour school environment and see if we can figure out some ways to protect hearing. Theleading cause of preventable hearing loss is excessive noise. Too much moderate noise for along time or some types of intense noise for even a short time can damage hearing. Loudnessis measured in units called decibels². One decibel¹ is the lowest sound that the average personcan here. Sounds up to 80 decibels generally aren't harmful. That's noise like traffic on a busystreet. But anything louder than 80 decibels， especially with continuous exposure， mayeventually hurt your hearing. Once you are up to around 140 decibels， that's like a jet planetaking off， then you might even feel pain in your ears. And pains are sure sign that yourhearing's at risk. Even one exposure to a really loud noise at close range can cause hearingloss. So what you need to do is limit your exposure to harmful levels. If you pass along thishandout， we can take a look at the decibel level of some common campus sounds. Notice howloud those horns are that people take to football games. They are really dangerous if blownright behind you. Now， let's try to generate a list of damaging noises.

 

1 decibel   

n.分贝(音量的单位)

参考例句：

• The noise pollution reached a high decibel level.噪音污染达到了很高分贝。
• In sound we use the decibel scale.在声学中我们采用分贝标度。

2 decibels   

n.分贝( decibel的名词复数 )

参考例句：

• The typical lawn mower makes about 90 decibels of noise. 典型的割草机发出的声响约为90分贝。 来自《简明英汉词典》
• A normal conversation reaches 55 decibels. 普通的谈话即可达55分贝。 来自《简明英汉词典》