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同学们，你们珍惜水吗？水可是非常宝贵的。如果你不信，那就看一看水在地球上的分布情况吧！ Students, do you cherish water? Water is very precious. If you don't believe it, take a look at the distribution of water on the earth! 同学们，你们知道吗？地球上水的总量约有13600000000立方公里，接近14亿立方公里，如果全部铺在地球表面，水层厚度可达到3000米，海洋中聚集着绝大部分水，占地球总水量的97.2%，它覆盖着地球表面的70%以上，陆地上的河湖沿的总水量的23万立方公里，其中淡水约占一半，只占地球总水量的万分之一（2.350%）。 Students, do you know? The total amount of water on the earth is about 13600000000 cubic kilometers, which is close to 1.4 billion cubic kilometers. If all the water is laid on the earth's surface, the thickness of the water layer can reach 3000 meters. Most of the water in the ocean, accounting for 97.2% of the total water on the earth, covers more than 70% of the earth's surface. The total water along the rivers and lakes on the land is 230000 cubic kilometers, of which the fresh water accounts for about half, only accounting for the total water on the earth One thousandth of the quantity (2.350%). 目前人类直接利用的是地下淡水湖泊淡水和河床水，占地球总水量的0.77%实际能利用的水只有0.2%。 At present, human beings directly use the fresh water of underground freshwater lakes and river beds, accounting for 0.77% of the total water volume of the earth, and only 0.2% of the water actually can be used. | 
