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.
研究人员认为一旦旋风、水和冰将带电微粒彼此分开，风暴即进入充电状态，产生被极度充电的云区。
Researchers believe storms become electrically charged when swirling wind, water and ice separate charged particles from one another, creating regions of cloud that are strongly charged.
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.
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