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1·A thin funnel cloud touches down in a field in northwest Iowa.

一个细细的漏斗云接近爱荷华州西北部的一块田地。

2·Then, all of a sudden, we've seen like a black funnel cloud.

然后，突然间，就看见像漏斗一样的黑云。

3·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。

4·Officials say one funnel cloud measured 450 meters across as it moved through eastern Kansas and western Missouri, blowing roofs off homes and uprooting large trees.

官员们说，一块直径450米的漏斗云在穿越堪萨斯州东部和西部时，将房顶揭起、树木连根拔起。

5·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.

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。