人们往往觉得打雷比闪电更可怕。其实,雷鸣只是在闪电传播时空气剧烈的爆炸声。可怕的是闪电。闪电是异常强大的电火花,在几分之一秒的时间里,可在天空中传播几千米。百年大树能被它折断,房屋会遭到它的破坏。因此,楼房、工厂的烟囱等高大的建筑物都要用避雷器来保护,让闪电顺着最短的路线传到地 People tend to think thunder is even more frightening than lightning. In fact, the thunder is just a dramatic explosion of air in the spread of lightning. Terrible is lightning. Lightning is an unusually powerful spark, which can travel a few kilometers in the sky in a fraction of a second. A century-old tree can be broken by it and the house can be damaged by it. Therefore, buildings, factory chimneys and other tall buildings have to use arresters to protect, so lightning down the shortest route to the ground