Magnets
美音、自然拼读、分级阅读与词汇复习
Table of Contents Invisible Magnetism.
内容表 无形磁性.
4 Magnets Everywhere.
4个磁铁到处都是
8 Glossary.
8 词汇表。
16 Invisible Magnetism A magnet is a special metal that attracts other metals.
16 隐形磁体 磁铁是一种能吸引其他金属的特殊金属.
Look around your home and try to find one.
看看你家周围 试着找一个
Did you know that there may be hundreds of magnets in your home?
你知道家里可能有上百个磁铁吗?
You can’t see most of them.
你看不到他们的大部分。
But they’re inside your telephone, blender, and hair dryer.
但他们在你的电话里,
Computers are full of magnets.
计算机充满了磁铁.
And most of the electricity that runs these things comes from magnetism.
而运行这些东西的电力大多来自磁性.
Many ob jects around your home use magnets.
你家周围有很多弹出物用磁铁
Magnetism is a force that’s invisible.
磁性是一种无形的力量。
This force only pulls on some metals, such as iron.
这种力只在一些金属上拉出,如铁.
A magnet will not pull on copper—or on wood, either.
磁铁也拉不上铜,
Magnetism flows through a magnet.
磁体通过磁体流动.
It goes in one end and out the other.
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These two ends are the north and south poles.
这两端为南北两端.
The force flows out the north pole and back in the south pole.
势力从北极流出后又回向南极.
Metal filings cling to the north (N) and south (S) poles of a bar magnet.
金属材料粘接在条形磁铁的北(N)和南(S)柱上。
You can use two magnets to feel magnetism.
你可以使用两个磁体来感受磁性.
The north pole of one magnet will attract the south pole of the other one.
一个磁铁的北极会吸引另一个磁铁的南极.
Now, try to push the two north poles together.
现在,尝试把两个北极一起推.
It isn’t easy!
这不容易!
Two north poles will always repel each other.
二道北极常相击.
So will two south poles.
二相南极相会也.
Repel Attract The opposite poles of two magnets will always attract each other.
恢复吸引 两根磁铁相向的极点总是会互相吸引.
The matching poles of two magnets will always repel each other.
两根磁铁相配的相接杆会永远相向而退.
Magnets Everywhere Magnets have many modern uses.
磁石到处都有现代用途。
One credit card can have millions of magnets.
一张信用卡可以拥有上百万个磁铁.
These magnets are tiny—no bigger than grains of powder.
这些磁铁是微小的,不比粉末粒还大。
Each tiny magnet points in its own direction.
每个微小的磁铁都指向自己的方向.
The different directions of the magnets make a code.
磁铁的不同方向形成了一个代码.
Computers read the code.
计算机读取代码。
Putting a credit card near a powerful magnet can mess up or erase the code.
在强磁铁附近放信用卡会弄乱或抹去密码.
At a store, when someone swipes a credit card, a computer reads that card’s code.
在商店里,当有人刷卡时,电脑会读出卡的密码。
The code is made of millions of tiny magnets.
密码是由数百万个微小的磁铁所制成的.
Magnets help make, and use, electricity.
磁铁有助于制造和使用电力。
Almost all the electricity you use comes from machines called generators.
你使用的电几乎全部来自称为发电机的机器.
Generators make electricity by spinning magnets around coils of wire.
发电机通过绕接线圈旋转磁铁来发电.
The magnetism makes an electric current in the wire.
磁性在电线中制造出电流.
These dam generators use the force of river water to spin magnets and make electricity.
这些水坝发电机利用河水的力量旋转磁铁并发电.
Electric motors work like generators in reverse.
电动机像发电机一样反向工作.
They use electric current and magnets to spin an axle.
他们使用电流和磁铁来旋转一轴.
The axle can be used to turn fans, cutting blades, or wheels.
车轴可以用来转动风扇,切割花刃,或轮子.
Fans, blenders, and remote-control cars use the power from these moving parts.
风扇、搅拌机和遥控车都使用这些移动部件的动力。
Current flows through copper wire.
流经铜丝.
When current flows, this becomes a magnet, too.
当电流流动时,它也会变成磁铁。
Magnets allow some high-speed trains to float above the track.
磁铁使得一些高速列车可以上行轨道.
The trains actually fly as they travel.
火车在行走时会飞起
This makes for a fast, smooth ride.
这使得快速,平稳地骑行。
Instead of having wheels like regular trains, this train in China floats on a magnetic cushion between the train and track.
中国的这趟列车没有像普通列车那样有轮子,而是在列车和轨道之间的一个磁缓冲上起浮.
It travels at a top speed of about 267 miles (430 km) per hour.
它的最高行驶速度约为每小时267英里(430公里).
Doctors use a very powerful magnet to look inside a person’s body.
医生们用非常强大的磁铁检查一个人的身体。
It helps doctors see cancer and other kinds of illness without having to cut open the person.
它帮助医生看到癌症和其他类型的疾病,而不必切开人口.
MRI brain scans like this one create dozens of detailed pictures for doctors to study.
核磁共振脑扫描像这个一样 制造出数十张详细的照片 供医生研究
The magnetic field produced by an MRI is about 1 0,000 times greater than Earth’s.
核磁共振产生的磁场大约是地球的10 000倍。
Magnets are fun.
磁石是乐趣。
They’re also really useful.
他们也非常有用。
Every time you watch television or even turn on a light, you are using magnets.
每当你看电视甚至打开一盏灯, 你都会使用磁铁。
Magnets help kids do lots of things they like to do.
磁铁帮助孩子们做很多他们喜欢做的事情.
Make your own magnet!
做你自己的磁铁!
You will need a large iron nail, a strong magnet, and several paper clips.
你需要一个大铁钉 强力磁铁 还有几个纸夹
and over.
并过.
the paper clips at once.
纸片片马上。