摘要
What are tornadoes?什么是龙卷风?Tornadoes,also called twisters,are vertical funnels of rapidly spinning air.龙卷风也叫旋风,是垂直的漏斗状高速旋转的气流。Tornadoes form when warm,humid air mix with cold,dry air.Tornadoes are born in thunderstorms and often come with hail.龙卷风形成于温暖、潮湿的空气与寒冷、干燥的空气对流时,是云层中雷暴的产物,同时常常伴有冰雹天气。
