How Sound Works
美音、自然拼读、分级阅读与词汇复习
Table of Contents Listening for Sound.
T能为声音收听内容.
4 Where Do Sounds Come From?
四声从何处来?
5 A Closer Look at Sound.
5,"更仔细地看声音".
9 Hearing Sound.
9 听觉声.
13 How to Describe Sound.
13 如何描述声音。
16 How Is Sound Used?
16 声音如何使用?
17 Enjoying Sound.
17"享受之声".
21 Conclusion.
21 结论。
22 Glossary.
22 词汇表。
23 Explore More.
23 探索更多。
24 Index.
24 指数。
24 Listening for Sound Choose a spot and close your eyes.
24,听声音选择点 闭上眼睛。
Listen carefully to what you hear.
细听所闻.
If you are in a classroom, you might hear voices, lights humming, or even pages turning.
如果你在教室里, 你可能会听到声音, 灯光鸣叫, 甚至翻页。
If you are outside, you might hear traffic noises or animal sounds, such as dogs barking or birds chirping.
如果你在外面,你可能会听到交通噪音或动物声音,例如狗叫或鸟叫.
If you’re in your living room, you might hear other sounds.
若您在客厅,
Where Do Sounds Come From?
声音从哪里来的?
Ponder this—if a tree falls in the forest and no one is around to hear it fall, does it still make a sound?
如果有棵树倒在森林里 周围没有人听到它倒下,它还会发出声音吗?
The scientific answer is yes.
科学答案是肯定的。
Sound is a form of energy caused by something vibrating.
声音是一种由震动所引发的能量形式.
Vibration occurs when an object moves quickly back and forth.
当一个物体快速地前后移动时会发生振动.
The greater the vibration, the more sound energy is created.
振动越大,产生出越多的声能.
When the tree falls, it moves the surrounding air and makes it vibrate.
当树倒下时,会移动周围的空气并让它振动.
Sound moves outward in all directions from the falling tree.
声音从倒下树向外移动
A crashing sound would be heard if someone were around to hear it.
如果有人在附近听到的话,就会听到爆炸的声音。
Sound moves away from the tree in waves.
相声从树入波.
Sound waves move through air, water, and solids.
声音波会通过空气,水和固体移动.
That means when an object vibrates, it causes vibrations in the matter that surrounds it.
这意味着当物体震动时,它会在环绕它的物质中引起振动.
When the tree falls, it sends out sound waves in all directions through the air and through the ground on which it falls.
当树倒下时,它通过空气和所倒下地上,向各个方向发出声波.
Bees’ wings provide another example of how sound moves.
蜜蜂的翅膀是声音如何移动的另一个例子。
The wings make the air around them vibrate, which causes a buzzing sound.
翅膀使周围的空气会震动,从而引起嗡嗡声.
The sound waves created by the bee’s wings move away from the bee in all directions.
由蜜蜂的翅膀所创造出的声音波从蜜蜂向各个方向移动.
No matter where you stand in relationship to the bee, you can hear the buzzing sound.
无论你站在哪里 与蜜蜂的关系, 你可以听到嗡嗡声。
A tree falling in the forest creates sound waves.
有棵树倒入森林 产生出声波
Beating wings create the buzzing sound that bees make.
击打翅膀会产生蜜蜂所发出的声音。
Sound travels differently through different types of matter.
声音通过不同种类的物质进行不同的传递.
The distance between particles in matter is what causes the difference.
物质中粒子之间的距离是造成差异的原因.
In gases, such as air, the particles are farther apart than they are in liquid.
在气体中,如空气中,颗粒相去较之于液体相去更远.
In liquids, such as water, the particles are farther apart than they are in solids.
在水等液体中,颗粒相去相去较于固体相去更远.
Particles that are closer together transfer sound energy more easily to one another.
比较相近的粒子可以更方便地相互传递出声音能量.
Sound transfers quickly through solids because the particles that make up most solids are close together.
声音通过固体迅速传递,因为构成大多数固体的粒子相接相近.
The transfer of sound is much slower in liquids and air because the particles are farther apart.
在液体和空气中,声音的传入要慢得多,因为颗粒相去更远.
Overall, the speed of sound varies, especially in gases.
总体而言,音速不同,特别是在气体中.
Sound travels more quickly in colder air than in warmer air because the particles are closer together.
声音在更冷的空气中行走比在更温暖的空气中行走更快,因为颗粒更相近.
Try This!
试一试！
Sound in Solids • Tap on your desk with a pencil.
用铅笔打到你的桌子上
• Listen to the sound.
• 听出声来.
the top of the desk.
桌子顶部
sound different?
听起来不一样?
Why?
为什么?
Try This!
试一试！
Vibration • Hold a ruler flat on a desk or table with one hand.
• 震动 单手把尺平地放在桌子上或桌子上.
• Hang one end of the ruler over the edge.
• 支助 将一端通通法相悬于边.
• Pull the ruler down with your other hand and let it go.
• 支助 用另一只手把统治者拉倒,放走他.
• Watch carefully to see the vibration of the ruler.
• 支助 仔细地观察着统治者的振动.
• Listen to hear the sound that it produces.
· 听其出声.
ruler vibrate.
尺之震动.
the sound change?
声音的变化?
Why does it change?
为什么它改变?
A Closer Look at Sound There are many different kinds of sound.
更仔细地看声音 声闻有多种相.
The characteristic of a sound wave determines what kind of sound it is.
声音波的特点决定了它是什么声音.
Two of the more common characteristics of sound are pitch and intensity, or loudness.
声音更常见的两个特征是发音和强度,或发音.
Pitch has to do with how high or low a sound is.
皮奇与音高多低有关.
A siren or whistle has a high pitch.
警笛或口哨的音响很高
Thunder or a bass drum has a low pitch.
雷霆或低音鼓有低音.
Pitch depends on something called frequency.
皮奇取决于所谓的频率。
Frequency is determined by how fast an object vibrates.
频率由物体振动的速度决定.
An object that vibrates fast has high frequency and makes a high-pitched sound.
震动快的物体具有高频并发出高发声.
An object that vibrates slowly has low frequency and makes a low-pitched sound.
一个慢慢震动的物体有低频并发出低调的声音.
High-frequency sound waves are more compressed, or closer together.
高频相声波压缩得较多,或更相近.
Low-frequency sound waves are farther apart.
低频相声波相去更远.
Because high- frequency sound waves are more compressed, more waves pass by a given point in one second than in low-frequency waves, which are more spread out.
由于高频声波的压缩性更强,因此相较于低频声波,波浪在一秒内就经过了某个定点,其分布范围更广.
Sound Wave Frequency 3 + 5 + 2 = 10 – 4 + 10 ÷ 2 = 14 x 2 – 3 = 25–5–5+2=17+3x2–2 0÷2–7=3+5+2=10–4+10÷2=14x2–3=25– 5 –5+2 =17 + 3 x 2 – 2 0÷2–7= Math Minute On average, sound travels about 1,082 feet per second through air.
声波频率3+5+2 = 10 — 4 + 10 — 2 — 14 x 2 — 3 — 25 — 5 — 5+2 = 17+3x2 — 2 0÷2–7=3+5+2=10–4+10÷2=14×2–3=25=5 –5+2=17 + 3×2=2 0÷2–7=数学分钟. 平均来说,声音通过空气行走约每秒1082英尺.
Some jet planes travel faster than the speed of sound.
一些喷气式飞机飞行速度快于音速.
When they break the sound barrier, a loud sonic boom can be heard for miles away.
当他们打破了音障后,能听到一股响亮的音响在几英里外.
There are 5,280 feet in one mile.
一英里内有5,280英尺
A jet flying six miles above the ground breaks the sound barrier.
一架飞机从地上飞出6英里,打破了音障.
How long will it take for someone on the ground to hear the sonic boom?
地上人听出声震能活多久?
Frequency is measured in a unit called hertz (hurts).
频率用一个叫hertz (hurts)的单位来测量.
One hertz means one wave passes by a point every second—in other words, one vibration occurs each second.
1赫兹表示一波每秒经过一分一分——换句话说,每秒会发生一波震动.
Humans hear sounds that have a frequency between 20 and 20,000 hertz.
人类听到的声音频率在20到2万赫兹之间.
Hummingbird wings vibrate rapidly to make a high-pitched sound.
蜂鸟的翅膀会迅速震动,发出高发声.
If an object vibrates less than 20 times per second or more than 20,000 times per second, you probably will not hear it.
如果一个物体每秒震动不到20次或者每秒超过2万次,你很可能不会听到.
Some animals, such as dogs, can hear sounds above 20,000 hertz.
有些动物,如狗,可以听到超过2万赫兹的声音.
Each different sound has a different frequency.
每个不同的声音都有不同的频率.
For example, humans can make different sounds that range from about 100 to 1,000 hertz.
例如,人类可以发出从大约100至1000赫兹的不同声音.
Now let’s look at intensity.
让我们看看强度。
Intensity has to do with how loud a sound is.
强度与声音多响有关系.
It also has to do with the amount of energy a sound wave contains.
也与音波所包含能量的量有关.
Loud sounds have more energy than quiet sounds.
大声的声音比安静的声音更有能量.
Thunder has lots of energy and can be very loud.
雷霆有很强的能量,而且可以发出很大的声音.
The buzzing sound of a mosquito has very little energy and is not very loud.
蚊子的叫声能量很少,声音也不太响.
As sounds move away from their source, they lose energy and become softer.
随着声音远离源头,它们会失去能量并变得更柔软.
The intensity of a sound gets less and less as you get farther away from the object making the sound.
声音的强度随着远离发出声音的物体而越来越少.
Loudness or intensity is measured in a unit called a decibel (DES-eh-bel).
高音或强度用一个叫分贝(DES-eh-bel)的单位来测量.
You can barely hear Try This!
你几乎听不见试一试！
Pitch Practice • Gather a group of same-sized drinking glasses.
Pitch练习会 • 聚集一群同尺寸的酒杯.
Use glass, not plastic.
使用玻璃而不是塑料.
• Fill each glass with a different amount of water.
• 支助 每杯取出不同量水灌之.
• Tap on the lip of each glass with a metal spoon.
• 支助 用金属勺子敲住每杯的唇.
• Listen to the pitch.
——听投出.
• See if you can arrange the glasses from high to low pitch.
• 支助 看能不能把眼镜从高到低排列好
• Try changing the amount of water in each glass.
• 支助 尝试改变每杯的水量.
• Try different-sized glasses or containers.
• 支助 尝试不同大小的眼镜或容器.
Table of Decibels Sound Source Decibels Whisper.
(原始内容存档于2017-10-21). Decibels Sound source Deibels Whisper.
20 Hair dryer.
20发干燥机.
60–90 Telephone ring.
60-90页 电话铃
80 Sound Source Decibels Leaf blower.
80 声源Decibels Leaf吹哨.
110 Rock band or siren.
110摇滚乐队或警笛.
120 Jet airplane.
120喷气机。
150 Challenge: Try to tap out a simple tune.
150 挑战: 试着找出一个简单的曲子。
Energy of Sound High intensity Low intensity a sound of 10 decibels.
高强度能量 有10分贝的声音,强度低
But a sound of 70 decibels is considered loud.
但70分贝的声音被认为是响亮的.
In fact, a 70-decibel sound has about 1,000 times more energy than a 40-decibel sound.
事实上,一个70-decibel音能比一个40-decibel音能多出约1000倍.
If a sound reaches 140 decibels, it has so much energy that it will damage your ears.
如果一个声音达到140分贝, 它有如此多的能量, 它会损害你的耳朵。
The ear is what makes it possible for humans to hear.
耳能令众生得闻.
Parts of the Human Ear Hearing Sound Ears play a big part in the ability to hear sounds.
人耳听音的部分在听出声音的能力中起很大的作用.
The outer ear plays only a small part in the hearing process.
外耳在听觉过程中只演奏了一小部分.
It acts like a sound collector.
表现得像个收音机
Its shape helps gather sound waves and move them along to the middle ear.
它的形状有助于收集出声波,并把它们移动到中耳.
The middle ear and inner ear are designed to transfer sound waves to nerves that carry signals to the brain.
中耳和内耳被设计成能将声音波传递给神经,将信号传递到大脑.
The brain then interprets the sound and gives your body commands to respond to the sound.
大脑然后解释出声音,并给你的身体命令来响应声音.
For example, if the sound of an alarm clock reaches your brain, the brain tells your muscles to get you out of bed.
例如,如果警报钟的声音传到你的大脑,大脑会告诉你的肌肉让你起床.
Your middle ear has an eardrum that vibrates when sound waves hit it.
你的中耳有耳膜 当声音波击中它时会震动
The eardrum transfers vibrations to three tiny, sensitive bones.
耳膜转移振动到三个微小而敏感的骨头上.
It is important to be careful around loud noises, such as loud music or machinery, which can damage the middle ear.
围绕会损坏中耳的响出声响,如出声的音乐或机械,必须小心.
Some damage can cause permanent hearing loss.
有些损害可能造成永久性听力损失.
The tiny bones transfer the sound waves to the inner ear.
细小的骨头会把声音波转移到内耳.
The inner ear has a snail-shaped part called a cochlea.
内耳有蜗牛形的部分被称作克氏耳.
It contains liquid and tiny nerve cells that change the sound vibrations into electrical impulses that are sent along nerves to the brain.
它包含液体和微小的神经细胞,能将声音振动改变为电冲动,并随神经传入大脑.
The brain can then figure out what sound is being heard and tell your body how to react.
然后大脑就能知道 听到什么声音 并告诉你的身体如何反应
How to Describe Sound The brain connects the message it receives from the ear with your own knowledge.
如何描述声音 大脑将它从耳朵收到的信息与你自己的知识联系起来.
Sound is often described by what makes the noise—for example, it sounds like a horn.
声音经常被描述为是什么使噪音——例如,声音听起来像个角.
Sometimes sound is described by the noise it makes, such as a beeping sound.
有时会用它发出的噪音来描述声音,例如叫声.
Words that imitate sounds are called onomatopoeia (ahn-o-mat-o-PEE-ah).
模仿声音的词被叫作"取出"(ahn-o-mat-o-PEE-ah).
Plop, screech, bang, and swoosh are all examples of onomatopoeia.
口出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出声出出声出声出声出声出声出声出声出声出出声出出声出声出出声出声出声出出出出出声出声出声出出出出出声出声出出声出出出出出声出出出出出出出出出出出出出出声出声出声出声出声出声出声出声出声出出声出出声出声出声出声出声出声出出声出声出声出声出声出声出声出
So are the sounds animals make— meow, woof, growl, and hiss.
动物们发出的声音也一样,它们有微声,有叫声,有叫声,也有叫声。
Do You Know?
你知道吗?
Many people with hearing difficulties learn to communicate without sound.
许多听力有困难的人学会了没有声音的交流.
They use sign language and their other senses to communicate with the world around them.
他们使用手语和其他感官与周围的世界交流.
These children have hearing aids to help them hear.
这些儿童有助听器,帮助他们听话。
What could be making the noises in this chart?
这张图表里有什么声音?
Pitch Intensity high loud low soft high soft low loud Onomatopoeia whee splash ribbit roar Object Devices can be used to help people hear.
Pitch Instenity 高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高音高
Hearing aids change the sound frequency and help sound waves to travel through the ear.
听觉辅助器改变声频,帮助声波穿耳而行.
There’s also an operation that involves inserting a cochlear implant.
还有一项手术涉及插入人工耳蜗植入。
This operation has helped many people hear what they couldn’t hear before.
这个行动帮助许多人听到他们以前听不到的。
It takes time for the brains of people with new hearing aids or cochlear implants to learn what sounds are being heard.
使用新助听器或人工耳蜗植入器的人的大脑需要时间来学习所听到的声音。
How Is Sound Used?
声音用得怎么样?
People and other animals have always used sound.
人们和其他动物总是使用声音.
People communicate by talking and listening.
人们通过交谈和倾听来沟通.
Laughter is a sound people make when they are happy.
欢笑是人们快乐时发出的声音。
The sound of someone crying usually means they are sad or hurt.
某人哭泣的声音通常表示他们悲伤或受伤.
Other animals also communicate with sounds.
其他动物也会用声音进行交流.
Animals make noises that can say, “Danger is near” or “I’d like to get to know you.”
动物们发出声音, “
Different sounds mean different things.
不同的声音意味着不同的东西。
For example, a loud bang might mean “WATCH OUT!”
例如,大爆炸可能意味着“退出! “
to both people and other animals.
对人和其他动物来说
Wolves howl to communicate with other members of their packs.
野狼呼喊着要和他们包里的其他成员沟通
Waterfalls often can be heard long before they are seen.
瀑布往往在被看到之前就能够被听到.
Sounds also can give immediate information about the environment.
声音还可以提供环境的即时信息.
A low rustling in the bushes, for example, tells that something is moving around in there.
例如,灌木丛中低地生锈 说明里面有些东西在移动
A whistling in the trees might mean it is getting windy.
在树上吹口哨可能意味着它变得风起云涌。
Dripping or trickling noises indicate that water is nearby.
滴入或滴入的噪音表明水就在附近.
A foghorn signals a ship that a dangerous object might be in its path.
雾号向一艘船发出信号 危险物体可能已经进入航道
of beeping noises.
发出叫声
of the flying bat.
飞蝙蝠。
flying insects.
飞行昆虫。
to the bat.
对蝙蝠。
5 The bat picks up the reflected sound with its super- sensitive ears.
页:1 蝙蝠用它的超敏感耳朵来取出反射出的声音.
interprets the size, distance, speed, and direction of the insect.
解释昆虫的大小,距离,速度和方向.
Zap— it’ s dinnertime.
吃晚饭了,
In modern times, humans have found new ways to use sound.
在现代,人类找到了使用声音的新方式.
People use sound waves to search for schools of fish in deep ocean waters.
人们用声波来搜寻深海水域的鱼群。
Sonar uses waves that are sent out and return with a different frequency when they bounce off objects.
声纳使用被发射出并反射出物体时使用不同频率回波.
Using this sounding technique, fishers can tell when fish are under their boats.
使用这种测音技术,渔民可以分辨出何时有鱼在船下.
Many animals have built-in sounding systems to help them navigate and find food.
许多动物有内置的探空系统来帮助它们导航并寻找食物.
Bats use a technique called echolocation.
蝙蝠使用一种叫做回声定位的技术.
They send out sound waves that are reflected back by insects, trees, or other objects.
它们发出被昆虫,树木或其他物体反射出的声音波.
When the waves bounce off objects and come back to the bats, the waves are a different frequency.
当波从物体上弹出并回击出蝙蝠时,波是不同的频率.
This technique allows bats to find food at night when they hunt.
这种技术可以让蝙蝠在夜间猎取食物.
Dolphins also use sonar to help them find their way around the ocean.
海豚还用声纳来帮助它们找到环绕海洋的道路.
How Echolocation Works When hit by sound waves, objects reflect different frequencies.
如何回声定位 工程 当被声波击中时,物体反射出不同的频率.
Waves bounce back from the school of fish.
波从鱼之所回弹.
Sound waves are sent out by the ship.
声波由船出.
Waves bounce back from the ocean floor.
浪从洋底回弹.
Sound waves also are used to take pictures inside a human body.
声音波也用于拍摄人体内部相片.
Using ultrasound, doctors can see a baby inside its mother’s body before it is born.
使用超声波,医生可以在婴儿出生前看到婴儿在母亲体内.
As with sonar, sound waves reflect off the baby and return at a different frequency.
和声纳一样,声波反射出婴儿,以不同的频率返回.
Enjoying Sound Musical instruments have been created from experiments with different types of sounds.
享受相声乐器是用不同类型相声的实验产生的.
A famous group called Stomp uses garbage cans, brooms, and pipes to make music.
一个叫"斯托普"的著名团体使用垃圾桶,扫帚和管子来制作音乐.
Once they even danced on top of an old school bus as part of a concert.
一次他们甚至跳起舞 在老校车上作为音乐会的一部分。
Sounds can make people feel strong emotions.
声音可以让人感到强烈的情感.
Even a kitten purring or a mother humming to her baby can create feelings of calm and love.
即使是小猫 或母亲哼着她的孩子, 也能产生平静和爱的感觉。
People can describe their experiences based on sounds.
人们可以根据声音来描述自己的经历.
If someone talks about the ocean, you can almost hear the water crashing on the beach.
如果有人谈论海洋,你几乎可以听到海滩上的水相撞.
Or you might hear sea gulls squawking or squeals of delight from other beach-goers.
或者你可能会听到海鸥叫叫声 或是其他海滩游民的欢快声
Conclusion The world is filled with sound energy caused by objects vibrating all around us.
结论 全世界充满着由周围物体震动引起的声音能量.
Many kinds of sound waves moving through the air cause sounds that may be loud or soft, high or low, pleasant or annoying.
许多种类的声音波从空气中移动,引起声音,这些声音可能响出或柔和,高或低,令人愉快或烦恼.
Pay close attention and discover new sounds that can provide information about the world around you.
密切关注并发现能够提供周围世界信息的新声音.
Sound helps to explain things, gives details about settings and objects, and creates emotions and feelings.
声音有助于解释事物,给出设置和对象的细节,并创造出情感和感情.
Think about all the ways sound enters your life.
思惟一切道声入于生.
The group Stomp uses brooms to make music.
组用扫帚来制作音乐.
Glossary cochlea snail-shaped tube with nerve fibers, which is found in the inner ear (p.
词汇cochlea蜗牛形管有神经纤维,见于内耳(p.
14) compressed squeezed together (p.
14)被压缩在一起(p.
10) decibel a unit that measures the loudness or softness of sounds (p.
10)分解测量出声音的出声或柔和度的单位(p.
11) echolocation a method of locating objects using sound waves bounced off objects (p.
11)回声定位一种利用从物体上弹出的声音波来定位物体的方法(p.
20) frequency rate of vibration of a sound wave (p.
20)声波的振动频率(p.
9) hertz unit of measure of sound frequency (p.
9) 声频的赫兹度量单位(p.
10) intensity the amount of energy per unit of sound (p.
10) 强度为每个声音单位能耗(p.
9) onomatopoeia words that imitate sounds and noises, such as hiss or beep (p.
9)取自模仿出他的声音和噪音等出声或叫声(p.
16) pitch the highness or lowness of a sound (p.
16)将声音的高低投出(p.
9) sonar system that sends high-frequency sound waves through water and registers the vibrations reflected by an object (p.
9)声纳系统,通过水来发送高频声波并记录物体所反映振动(p.
19) sonic boom explosive sound made by aircraft moving faster than the speed of sound (p.
19) 由飞机所制造的声爆爆炸声比音速快(p.
9) sound barrier large increase in air resistance encountered by aircraft flying at the speed of sound (p.
9) 声音屏障 以声音速度飞行的飞机遇到的空气阻力大增 (p.
9) sound waves the movement of energy through a gas, liquid, or solid (p.
9) 通过气体,液体,或固体(p.
6) ultrasound sound with a frequency above what humans can hear (p.
6) 频率高于人类能听到的超声波声音(p.
20) vibrating moving back and forth quickly (p.
20) 震动回转速度快(p.
5) Index brain(s), 13-16 cochlea, 14, 15 communicate, 15, 17 decibel, 11, 12 eardrum, 13, 14 ear(s), 8, 13-16,20 echolocation, 20 fish, 19 frequency, 9-11, 15, 19, 20 hearing aids, 15 hertz, 10, 11 intensity, 9, 11 liquids, 7, 8 onomatopoeia, 16 pitch, 9-12, 16 ruler, 7 solids, 7, 8 sound wave(s), 6, 10, 13, 14, 19, 20, 22 travel(s), 7-9, 15 ultrasound, 20 vibrate(-ing)(-ion)(s), 5-7, 10, 13, 14, 22 Explore More On the Internet, use www.
5) Index brain (s), 13–16 cochlea, 14, 15 communication, 15, 17 decibel, 11, 12 eardrum, 13, 14 ear (s), 8, 13–16, 20 回声定位, 20 鱼, 19 频率, 9–11, 15–19, 20 助听器, 15 hertz, 10–11 强度, 9, 11 液体, 7, 8 肿瘤, 16 规则, 7 7 8 声波, 6, 10, 13–14, 19, 20, 22 出行(s), 7, 10–13, 14, 22 Explore More on the Internet, 使用 www.
google.
Google (英语).
com to find out more about topics presented in this book.
了解更多本书中介绍的主题
Use terms from the text, or try searching for glossary or index words.
使用文本中的术语,或者尝试搜索词汇或索引词.
Some searches to try: sound waves, onomatopoeia, or hearing loss.
某些搜索尝试:声音波,多发多发,或听力损失.