The ruin of the house was caused by a violent tornado.

一阵猛烈的旋风把房屋卷倒了。

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A violent tornado hit the southern part of Oklahoma, US, on Friday night, killing at least 15 people and injuring dozens, according to US media.

据美国媒体报道，当地时间10日晚，俄克拉荷马州南部受到一股猛烈的龙卷风袭击，目前造成至少15人死亡和数十人受伤。

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The tornado was one of many spawned by a vast, violent storm system that has so far killed as many as 231 people in six U.S. states as of Thursday, according to CNN.

根据美国有线新闻网（CNN）的报导，这次的龙卷风和其他龙卷风一样产生于一个巨大的破坏力极强的风暴，到星期四为止，这场风暴已经使美国6个州共231人丧生。

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The area where the most violent tornadoes usually happen is known as "Tornado Alley."

VOA: special.2010.05.11

The difference is that on these violent tornado days, the balloon does not just rise in a leisurely way.

CNN: The making of a nightmare tornado

"Yet it was a relatively ordinary violent tornado, " according to Brooks, an acknowledged expert on the climatology and probability of twisters.

CNN: Moore in bull's-eye twice, science may know why

And in the most extreme cases, a violent tornado is born beneath that spinning white cloud of updraft that meteorologists call the supercell thunderstorm.

CNN: The making of a nightmare tornado