The weather has a lot to do with our life .For one thing ,our crops depend on it. They will suffer if it is too dry or too wet. So men have long hoped to find a way to get control of it. But their efforts have up to now produced little results.　　Though it is true that no one can change the weather, nor can anybody completely control it, we have learned many things about it from experience and through study. We have found that ccrtain signs appear when there is going to be and big change in the weather. If v'e read the signs correctly, we can tell what the more important changes in the weather will be ,This way of telling what the weather will be like on the following day or two is called"weather forecast"　　People in all countries have for many years studied the weather and tried to make weather forecasts.The following are some of their findings.　　Sometimes distant objects such as hills and tall trees seem to be very clear and near .This is a sign of much water vapour, which shows that rain will probably come.　　When distant sounds, such as the noise from far-off trains, are heard very clear, then wet and stormy weather is on the way.　　If you see a rainbow during rainy weather, this is a sign that it will clear up and become fine .Such rainbows always come in the evening .However, if a rainbow appears in the morning, then you may take it that rainy weather will come .If the stars twinkle clearly at night then fair weather will probably continue.　　And then many people feel in their bones the coming of wet weather .Their joints or their old wounds ache, which always tells them if it is going to rain.　　Most of the above sayings have been made by people who have used their eyes and brains, and they have proved to be very useful in forecasting the weather.

天气跟我们的生活息息相关.举一个例子来说,庄稼的生长就跟天气有关.如果天气太干燥或太潮湿庄稼的生长就会受影响.所以人们才强烈的渴望能找到方法来控制天气.但是人们的努力几乎没有成效.尽管确实没有人可以控制天气,或者说没有人能完全控制它,但是我们也从经验和学习中学到了很多东西.我们已经知道当天气有明显变化的时候会有特殊的征兆.如果我们能正确的领会这种征兆,我们就能分辨出天气将会如何变化,这种分辨天气在未来几天内变化的方法就被称作 “天气预报”. 各国的人们已经研究了很多年,并且努力预告天气.以下是他们的一些研究成果. 有时候远处山和树之类的物体看起来很清晰很近.这就是过多的水蒸气导致的,它预示着将有降雨. 当远处的声音比如远处的火车声,听起来非常清晰,那么暴雨即将来临. 如果你在阴雨天看到了彩虹,那么这就是天气即将放晴的信号.这样的彩虹经常在傍晚出现. 但是如果早晨出现了彩虹,你就要明白阴雨天就要来临了. 如果星星在夜空中明亮的闪耀,那么接下来很可能是晴天. 有些人能通过他们的骨头来感觉到潮湿气候的来临.他们的关节或者旧伤口的疼痛总会提醒他们快要下雨啦. 人们得出的这些结论中的大部分都是人们用他们的眼睛或者大脑总结出的, 并且这些说法被证实在预报天气中是非常有用的.