2014職稱英語理工C閱讀理解原文第一篇

　　原文：補(bǔ)全短文第五篇 The Magic of Sound

　　2014年職稱英語真題理工C閱讀理解第一篇

　　Music is one of the most beautiful forms of artistic expressions ever invented. In movies and plays, music has an added function1: it not only moves people but also can shock people. Is it true that an ordinary musical instrument can be so powerful?

　　Our eardrums can withstand sound within 20 to 80 decibels. Once sound exceeds this limit2, even beautiful music will become ear-splitting noise3 and harm health. A strong blast of high sound can twist and break a solid iron sheet. High sound of 150 decibels can kill a healthy rat

　　The noise from a plane's engine is over 140 decibels. However, the sound of a flute is at most a few decibels. Therefore, the sound of ordinary musical instruments cannot harm your health.

　　It has been proven that people who have worked in an environment with a high sound intensity for a long time suffer varying degrees of heart disease or altered brain waves.

　　In movies, sometimes the hero can produce a sound that ordinary people can't hear and only those who have the same ability can feel. In nature, there is actually sound that is beyond our hearing. In physics, the sound that exceeds 20,000 Hz is called ultrasonic. Dolphins, whales and bats can make such high-frequency sound. It does no harm to health.

　　Sound less than 20 Hz is called infrasonic waves. When we move, the air will vibrate. The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance in human bodies. As a result, people's vision may weaken and internal organs4 may rupture. However, whether an infrasonic wave can be used as a weapon depends on its intensity5. If its intensity is very low, it won’t damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels, it is extremely harmful. When wind blows at a force of 3 or 4 over the sea6, it will produce infrasonic waves of several decibels. Only typhoons can produce infrasonic waves of over 100 decibels. At present, scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.

　　譯文：奇妙的聲音

　　音樂是最美妙的藝術(shù)表達(dá)形式。在電影或是戲劇中，音樂有一種另加的功能，不僅能感動(dòng)人也能使人震撼。一件普通的樂器真的能這樣有魔力嗎?

　　我們的耳膜能夠接收20~80分貝的聲音。一旦超越了這個(gè)界限，再美的音樂也只是震耳的噪聲，還會(huì)危害健康。一陣高分貝的強(qiáng)烈地沖擊波能使一塊鐵板扭曲和破裂。高達(dá)150分貝的聲音能殺死一只健康的老鼠。

　　飛機(jī)引擎發(fā)出的噪聲超過類140分貝。而長(zhǎng)笛發(fā)出的聲音最多只有幾個(gè)分貝。所以，一件普通樂器發(fā)出的聲音不會(huì)危害你的健康。經(jīng)證實(shí)，長(zhǎng)期在高強(qiáng)度聲音環(huán)境中工作的人會(huì)引起不同程度的心臟疾病或腦電波的改變。

　　在電影里，有時(shí)英雄主角能發(fā)出常人無法聽到的聲音，只有具有相同能力的人才能夠感受到。在自然中，確實(shí)有一種聲音在我們的聽力之外。物理學(xué)中，超過20000赫茲的聲音稱為超聲波。海豚、鯨魚和蝙蝠能發(fā)出這樣高頻的聲音。這些聲音對(duì)我們的健康無害。

　　低于20赫茲的聲音稱為次聲波。當(dāng)我們移動(dòng)時(shí)，空氣會(huì)振動(dòng)，空氣的振動(dòng)會(huì)產(chǎn)生次聲波。由于次聲波的頻率接近于人體內(nèi)部器官的頻率，它能夠引起人體的共振。所以，人的視力會(huì)下降，內(nèi)部器官會(huì)破裂。但是，次聲波能夠用作武器取決于次聲波的強(qiáng)度。如果次聲波的強(qiáng)度低，不會(huì)傷害人的內(nèi)部器官或影響人的健康。如果次聲波的強(qiáng)度超過160分貝，就極為有害。當(dāng)海面上吹起3~4級(jí)風(fēng)的時(shí)候，會(huì)產(chǎn)生幾種分貝的次聲波。只有臺(tái)風(fēng)能夠產(chǎn)生超過100分貝的次聲波。現(xiàn)在，科學(xué)家只能在實(shí)驗(yàn)室中，通過先進(jìn)的科學(xué)工具和強(qiáng)大的電力才能制造次聲波武器。

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