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.
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