2014职称英语理工C阅读理解原文第一篇

　　原文：补全短文第五篇 The Magic of Sound

　　2014年职称英语真题理工C阅读理解第一篇

　　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.

　　译文：奇妙的声音

　　音乐是最美妙的艺术表达形式。在电影或是戏剧中，音乐有一种另加的功能，不仅能感动人也能使人震撼。一件普通的乐器真的能这样有魔力吗?

　　我们的耳膜能够接收20~80分贝的声音。一旦超越了这个界限，再美的音乐也只是震耳的噪声，还会危害健康。一阵高分贝的强烈地冲击波能使一块铁板扭曲和破裂。高达150分贝的声音能杀死一只健康的老鼠。

　　飞机引擎发出的噪声超过类140分贝。而长笛发出的声音最多只有几个分贝。所以，一件普通乐器发出的声音不会危害你的健康。经证实，长期在高强度声音环境中工作的人会引起不同程度的心脏疾病或脑电波的改变。

　　在电影里，有时英雄主角能发出常人无法听到的声音，只有具有相同能力的人才能够感受到。在自然中，确实有一种声音在我们的听力之外。物理学中，超过20000赫兹的声音称为超声波。海豚、鲸鱼和蝙蝠能发出这样高频的声音。这些声音对我们的健康无害。

　　低于20赫兹的声音称为次声波。当我们移动时，空气会振动，空气的振动会产生次声波。由于次声波的频率接近于人体内部器官的频率，它能够引起人体的共振。所以，人的视力会下降，内部器官会破裂。但是，次声波能够用作武器取决于次声波的强度。如果次声波的强度低，不会伤害人的内部器官或影响人的健康。如果次声波的强度超过160分贝，就极为有害。当海面上吹起3~4级风的时候，会产生几种分贝的次声波。只有台风能够产生超过100分贝的次声波。现在，科学家只能在实验室中，通过先进的科学工具和强大的电力才能制造次声波武器。

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