托福聽力是考試難點，那么好的聽力資料有哪些呢?想必是出國人士比較關(guān)心的問題，和出國留學(xué)網(wǎng)托福欄目小編一起來了解了解托福聽力素材：噪音影響，歡迎閱讀。
托福聽力素材：噪音影響
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.
我很高興在這里見到你們中的許多人。我們已經(jīng)對健康中心感到震驚了，因為我們看到的學(xué)生人數(shù)，他們正在經(jīng)歷聽力損失。首先，我想介紹一些關(guān)于聽力的基本知識。然后我們可以看看我們的學(xué)校環(huán)境，看看我們是否能找出一些保護(hù)聽力的方法?？深A(yù)防聽力損失的主要原因是過度的噪音。長時間的適度噪音或某些類型的強(qiáng)烈噪聲，即使短時間也會損害聽力。響度是用分貝來衡量的。一個分貝是普通人能聽到的最低音。聲音高達(dá)80分貝通常是無害的。這就像繁忙街道上的交通噪音。但是，任何高于80分貝的聲音，尤其是持續(xù)暴露的聲音，最終都會傷害到你的聽力。一旦你達(dá)到140分貝，那就像噴氣式飛機(jī)起飛一樣，你甚至可能會感到耳朵疼痛。疼痛是你的聽力有危險的信號。即使是在近距離的噪音下，也會引起聽力損失。所以你需要做的是限制你暴露在有害的水平。如果你通過這份材料，我們可以看看一些普通校園聲音的分貝等級。注意人們在看足球比賽時那些角有多響。如果你被吹到后面，那就太危險了?，F(xiàn)在，讓我們試著生成一串有害的聲音。