Earth is an ocean planet.About three billion years ago,life on our planet began in the deep blue seas.
大约在三十亿年前,地球是一个海洋的星球,我们这个行星上的生命起源于蓝色的海洋之下.
Ninety-nine percent of the livingspace on earth is in the oceans.So water is very important for us.
地球上有百分之九十的生命物种在海洋中,所以,水对我们很重要
The water is being widely used for electricity agriculture,home use,industry,transport,entertain---ment,and so on.But the majority of people have not realized this problem.
水广泛地应用于农业用电,家庭用电,工业,交通,娱乐等等.但是大多数人民没有认识到这个问题.
Since changes in salinity and temperature affect Water's density,the water in the ocean is always moving.
由于盐度和温度变化会影响水的密度,在海洋中的水总是在运动.
Dense water sinks and less dense water is pushed to the surface,
密度大的海水下沉,密度较小的水被推到了表面
This circulation adds energy to the marine ecosystems and moves nutrients around.
这种循环为海洋生态系统提供能量使营养物质四处游动.
Isn't it amazing that a single substance can be so important to out planet and even the whole universe?Water,which seems so simple and common,is what makes life possible.
是不是惊讶,一个单一物质对于地球乃至整个宇宙可以如此非常重要?水,很简单很常见的东西,使生命成为可能.
Of all the resources on earth--oils,gas,gold and so on--nothing is as precious as a drop of rain.Learning about the properties of water helps us understand life on our planet.The most important thing we can learn about water,however,is that protect it and use it wisely.Our future depends on it.
在所有地球上的资源 - 石油,天然气,黄金等等 - 没有什么能比得上一滴水重要.认识到水的性质能帮助我们了解这个星球上的生命.最重要的事情,我们可以了解水,然后,保护它,更明智地利用它.我们的未来取决于它.