So this is a fire whirl generator.

这是一个火漩涡发生器。

One behaviour that Mark's team studies is what's known as a fire whirl.

马克的团队研究的一种行为是所谓的火漩涡。

Fire whirls are one of the most dangerous elements of a wildfire for firefighters.

对于消防员来说，火旋涡是野火中最危险的因素之一。

A fire whirl in 1923 in Tokyo was estimated to kill 38,000 people in less than 15 minutes.

1923 年东京的一场大火漩涡估计在不到 15 分钟的时间里造成 38，000 人死亡。

Fire whirls are an important phenomenon that occur in wildlands and they occur naturally and they occur very, very frequently.

火旋涡是发生在野外的一种重要现象，它们是自然发生的，而且非常非常频繁。