当上升气流与能形成风暴的湿热空气变成高速的旋风时，就形成了龙卷风。
Tornadoes form when the updrafts of air that supply storms with warm, humid air become a vortex, or high-speed whirlwind.
龙卷风是一种最猛烈、最具破坏性的旋风。
A tornado is one of the most violent and destructive whirlwind.
火焰龙卷风，也被称作“火旋风”，非常罕见。发生时火焰直线上升，如同龙卷风中空气的运行轨迹。
Fire tornadoes, also known as "fire whirls", only occur under certain conditions and form a vertical column of flames and hot air that behaves much like a normal tornado.
当上升气流与能形成风暴的湿热空气变成高死锬旋风时，就形成了龙卷风。
Tornadoes form when the updrafts of air that supply storms with warm humid air become a vortex or high-speed whirlwind.
除南极洲外，各大陆都在观测龙卷风，然而气象专家称，这种旋风在美国最为常见。
Tornadoes have been observed on every continent except Antarctica. But weather experts say they are most common is the United States.
除南极洲外，各大陆都在观测龙卷风，然而气象专家称，这种旋风在美国最为常见。
Tornadoes have been observed on every continent except Antarctica. But weather experts say they are most common is the United States.
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