To be able to get these measurements, the scientists have to get a tornado probe near or into a tornado.

为了能够得到这些测量结果，科学家们必须在龙卷风附近或龙卷风内部安装一个龙卷风探测器。

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One special tool is called a tornado probe.

一个特殊的工具叫做龙卷风探测仪。

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Jason's father immediately realized that a tornado was coming.

詹森的父亲立刻意识到一场龙卷风要来了。

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People driving during a tornado are told to find low ground and lay flat,facedown, with their hands covering their head.

VOA: special.2011.04.19

In the United States, the force of a tornado is judged by the damage to structures.

VOA: special.2010.05.11

Usually a community will receive a warning at least a few minutes before a tornado strikes.

VOA: special.2010.05.11

The Samarases and Young fell victim to particularly unpredictable storm, even for a tornado.

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"I had no idea a tornado could flatten whole neighborhoods like this, " he said.

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The cruelty of a tornado is that so often there is no time to evacuate.

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