如果是想要這句話的翻譯那就如下：
What can we benefit from saving the water?
如果是好處的話那就是
Firstly,the amount of water on the earth is huge,however,the amount of the water which is drinkable is little.We live on the earth.We live on the water.It is a treasure.If we did not make full use of it ,we would have no water to use in the future.
Secondly,water is needed in doing almost everything.If we saved the water,we would save the money which we spend in producing goods.We can use the limited water to make more profits.
Thirdly,the more water we need,the more water will be get from underground.If the level of the underground water decrease so much,the sea water will invade in it,making it no longer useful.