我们每天都要面对各种各样的天气，而风雨雷电是我们早已习惯的自然现象。为什么天空中时而狂风肆虐，时而暴雨倾盆时而又雷雨交加呢？这些奇妙的自然现象形成的原因是多种多样的，它们有着各自的特点以及不同的表现形式。一方面我们可以利用这些自然现象为我们的生产和生活提供帮助，另一方面它们所产生的自然灾害也时常威胁着我们的生产和生活。(We have to face various weathers every day, and the wind, rain, thunder and lightning are the natural phenomena that we have already been used to. Why there is strong wind, heavy rain or thunder storm in the sky sometimes? The reasons for the formation of these fantastic natural phenomena are varied. They have their own characteristics and different manifestations. On the one hand, we can make use of these natural phenomena to help our production and life. On the other hand, the natural disasters caused by them often threaten our production and life.)