龙卷风是一种伴随着高速旋转的漏斗状云柱的强风涡旋。
A tornado is accompanied by a high-speed rotation of the funnel cloud, in strong wind vortex.
由于龙卷风内部空气极为稀薄，导致温度急剧降低，促使水汽迅速凝结，这是形成漏斗云柱的重要原因。
As tornadoes internal air is extremely thin, leading to a sharp decrease temperature, water vapor to the rapid condensation, this is a funnel cloud, in the important reasons.
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