1看视频A （生词和重点句子如下）
2然后阅读（下面）
3看视频B，动手做实验
4 其他视频自由阅读浏览
生词和重点句子
equator 赤道
Low pressure 低气压
Warm and moist 温暖又潮湿
Soon the clouds and winds spin(旋转） around fueled（加燃料） by the oceans heat and water vapor(蒸汽)
Giant engines巨大的引擎
The eye of the hurricane ---the center of the hurricane,which is called the calmest part
The eye wall surrounds the eye, where the most damaging winds are found. It can range(漫游） anywhere, from 5-30 miles.
The rain bands（雨带） which surrounds the eye wall, these bands are a series of dense (稠密的；浓厚的 )clouds, that give a pin wheel like appearance to the hurricane, which range from 50-300 miles
阅读内容
What's the difference between hurricanes, cyclones and typhoons?
The rain bands which surrounds the eye wall, these bands are a series of dense (稠密的；浓厚的 )clouds, that give a pin wheel like appearance to the hurricane, which range from 50-300 miles
Hurricanes, cyclones and typhoons are all tropical （热带的；热情的；酷热的）storms. They are all the same thing but are given different names depending on where they appear.
When they reach populated areas they usually bring very strong winds and rain which can cause a lot of damage（损害；损毁）.
Hurricanes are tropical storms that form over the North Atlantic Ocean and Northeast Pacific.
Cyclones are formed over the South Pacific and Indian Ocean.
Typhoons are formed over the Northwest Pacific Ocean.
飓风，旋风和台风都是热带风暴。 它们都是一样的，但根据它们出现的位置给出不同的名称。
当他们到达人口稠密的地区时，他们通常会带来非常强烈的风和雨，这会造成很大的破坏。
飓风是在北大西洋和东北太平洋上形成的热带风暴。
旋风在南太平洋和印度洋上形成旋风。
台风形成于西北太平洋上空。
Why do storms have names?
Tropical storms last a long time and are given names so they can be identified（被识别的）quickly.
In most places, the first storm of a year will have a name beginning with A, such as Hurricane Alice, and the next one gets a name beginning with B.
Weather scientists hold meetings to decide on new names for the next year.
Names of storms which cause a lot of damage are never used again.
持续时间长的热带风暴，会被起名，以便快速识别。
在大多数地方，一年的第一场风暴将有一个以A开头的名字，比如飓风Alice，下一个名字将以B开头。
下个年度的新名称是气象科学家召开会议决定的。
造成大量破坏的风暴的名称，从未再次使用过。
What happens in a tropical storm?
Air rises quickly when it is heated by warm sea water.
As the air cools down again it is pushed aside by more warm air rising below it.
This cycle causes strong winds. Tropical storms have winds faster than 73 miles an hour.
当温暖的海水加热时，空气迅速上升。
随着空气再次冷却，它被更多的暖空气推到一边。
这个循环引起强风。 热带风暴的风速超过每小时73英里。
What damage do tropical storms cause?
Over the sea a tropical storm can whip（ 抽打；煽动；搅打） up huge waves.
When these waves reach land they can flood large areas, including towns and cities.
Over land the strong winds can cause a lot of damage - they can flatten homes, knock over trees and even tip over cars.
Tropical storms usually die out after a few days over land because there is no warm sea water there to power them.
equator 赤道
Low pressure 低气压
Warm and moist 温暖又潮湿
Soon the clouds and winds spin(旋转） around fueled（加燃料） by the oceans heat and water vapor(蒸汽)
Giant engines巨大的引擎
The eye of the hurricane ---the center of the hurricane,which is called the calmest part
The eye wall surrounds the eye, where the most damaging winds are found. It can range(漫游） anywhere, from 5-30 miles.
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