To form a tornado, cold air must sit above warm and moist air, and the wind needs to go in different directions at different heights, creating shear forces.
形成龙卷风，寒冷的空气必须处在暖湿的空气上部，而风应该在不同高度向不同的方向运动，以此创造出剪切力。
Inside the tornado probe, there are sensors to measure wind speed, temperature, pressure, and direction.
龙卷风探测仪的内部安装有传感器以测量风速、温度、压力和风向。
Researchers say that rapidly changing contrasts in wind and temperatures in an area just a few miles across can spawn a tornado in a matter of minutes.
研究员说，在仅有覆盖几英里的区域内，急剧变化的风和温度就可以在几分钟之内生成龙卷风。
An EF3 tornado now has wind speeds between 136-165 miles per hour (218-266 kilometers per hour), and the tornado pictured could be an EF3, EF4 or EF5.
现在的EF 3级龙卷风风速为每小时218至266公里，图中龙卷风可能为EF 3、EF 4或EF5。
From there, it went like a tornado wind.
就在那儿，像刮来了一阵龙卷风。
The United States now uses the EF (Enhanced Fujita) scale, which takes more variables into account when assigning wind speeds to a tornado.
美国现在使用EF（EnhancedFujita）级别，在为龙卷风确定风速时，纳入了更多的变数。
And let a person feel the sea to blow breeze, breeze into the wind, the wind has now become a tornado.
然后让人感觉海面上刮起了微风，微风又变成了大风，大风又变成了龙卷风。
It isn't the wind of tornado you see. It's the havoc it creates.
但你看到的并不是龙卷风的气流，你看到的是它制造的灾难。
And then up into the swirl around the axis, the wind always Tornado of the cyclone, its central pressure than the surrounding air pressure low 10 percent.
并随即变为绕轴心向上的涡流，龙卷中的风总是气旋性的，其中心的气压可以比周围气压低百分之十。
Tornado sudden and violent attacks, the wind is the strongest on the ground.
龙卷的袭击突然而猛烈，产生的风是地面上最强的。
You know tornado? Also a big wind .
你知道龙卷风?也是一种大风。
A tornado is accompanied by a high-speed rotation of the funnel cloud, in strong wind vortex.
龙卷风是一种伴随着高速旋转的漏斗状云柱的强风涡旋。
Tornado-type wind-powered water-pumping system is a newly developed system. It consists of tornado-type tower and pressure difference water-elevating device.
旋风风能提水系统是一种新型风力提水系统，该系统由旋风塔和气压差提水装置组成。
Tornado-type wind-powered water-pumping system is a newly developed system. It consists of tornado-type tower and pressure difference water-elevating device.
旋风风能提水系统是一种新型风力提水系统，该系统由旋风塔和气压差提水装置组成。
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