Tornadoes
美音、自然拼读、分级阅读与词汇复习
Introduction What can lift roofs from buildings and sweep houses into the air?
导言 怎样才能从建筑物上抬起屋顶,把房屋扫入空中?
Tornadoes can!
龙卷风可以!
Tornadoes come in many sizes.
龙卷风的大小很多
Some tornadoes are only a few feet (1 meter) across.
一些龙卷风只有几英尺(1米)高.
Others are more than a mile (1.6 km) wide.
另一些则宽一多英里(1.6公里).
Some tornadoes touch down for a short time.
一些龙卷风触倒了一段时间。
Others travel for hundreds of miles.
其人出行数百里.
How Tornadoes Form Why do tornadoes happen?
旋风如何形成 为什么会发生龙卷风?
Scientists are not sure.
科学家不确定。
Tornadoes come from giant thunderstorms called supercells.
龙卷风来自被称作"超级细胞"的巨型雷暴.
A supercell happens when warm, moist air rises to mix with cold, dry air.
当温暖而潮湿的空气升起与冷而干燥的空气相混合时,会发生超细胞.
The mixing of cold and warm air causes the air to spin.
冷暖空气的混合导致空气自旋.
The spinning wind turns into a cloud in a funnel shape.
旋转的风会变成漏斗状的云.
As the cloud turns, the wind becomes stronger.
如来云转相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相起相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相相
When the funnel cloud touches the ground, it is a tornado.
当漏斗云触地时,它就是龙卷风.
Measuring Tornadoes Scientists have a way to measure the strength of tornadoes.
测量"龙卷风" 科学家有办法测量"龙卷风"的强度.
They look at the harm caused by a tornado.
他们研究了龙卷风造成的伤害.
They use the amount of harm to estimate the wind speed.
他们利用伤害量来估计风速.
They use a special scale called the EF Scale.
他们使用一种叫"EF Scale"的特殊尺度.
The EF Scale measures the strength of the tornado.
欧元 尺度测量出龙卷风的强度.
Where Tornadoes Form Tornadoes may be hard to measure, but scientists have a good idea where they’ll strike.
龙卷风可能很难测量,
It’s true that a tornado can hit anywhere in the world at any time.
龙卷风确实随时都能袭击世界任何地方。
Most tornadoes happen in the central part of the United States.
大多数龙卷风发生在美国中部.
This area is called Tornado Alley.
这个区域被称为"龙卷风"(Tornado Alley).
More than one thousand tornadoes strike Tornado Alley each year.
一千多场龙卷风袭击了龙卷风 每年都有艾丽
Tornado Safety There is no way to be sure that a tornado will strike.
旋风安全 无法确定龙卷风会来袭
The National Weather Service (NWS) tries to help people stay safe during tornadoes.
国家气象局试图帮助人们在龙卷风期间保持安全。
If they put out a tornado watch, a tornado might strike.
如果他们放出龙卷风手表,龙卷风可能会袭击.
If they put out a tornado warning, a tornado has been spotted.
如果他们发出龙卷风警报 就会发现龙卷风
If there is a tornado warning, it’s important to get to a safe place.
如果有龙卷风警报,
Go indoors.
进入室内。
The safest place is a basement.
最安全的地方是一个地下室。
If you can’t get to a basement, go into a closet or bathroom.
如果你不能到地下室,
Stay away from windows.
离窗户远点
The spinning air in a tornado makes things fly around.
龙卷风中旋转的空气 使东西飞来飞去
This can be dangerous.
这可能是危险的。
It’s always important to protect your head.
保护你的头总是重要的。
You should get close to the ground.
你应该接近地面
Go under a desk or table.
在桌子或桌子下边
You can even lie down in a bathtub.
你甚至可以在浴缸里躺着
It is not safe to stay in a mobile home in a tornado.
住在龙卷风的移动家中不安全。
If you are in a tall building, go to the stairs.
如果你在高楼,就上楼梯
If you are in a car, wear your seatbelt and lean forward.
如果你在车里 系上安全带往前靠
If you are outside, lie down on the ground.
如果你在外边,就躺地上
Conclusion Tornadoes are amazing—and scary—examples of the power of nature.
龙卷风是大自然力量的惊人而可怕的例子。
People still have many questions about tornadoes.
人们对于龙卷风仍有许多问题.
What causes a tornado?
是什么引起龙卷风?
What is it really like inside a tornado?
龙卷风里面是什么感觉?
Maybe we will find out one day.
也许有一天我们会发现的