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Although the world is hungry, it is even thirstier.
雖然世界充滿了饑餓，但是它更加缺水。
While nearly 3/4 of the earth is covered with water, we are still short of drinking water.
盡管地球的四分之三都覆蓋著水，我們依然缺少飲用水。
This is because about 97% of the water on the earth is sea water.
因為地球上97%的水都是海水。
So we can't use it for watering plants or drinking directly.
所以我們不能用它來灌溉植物或直接飲用。
Humans can only drink and use fresh water from places including rivers, lakes and underground.
人類只能飲用來自河流、湖泊和地下的新鮮水。
How can we avoid a serious water shortage?
我們怎樣能避免嚴重的水資源短缺呢？
First, we should save water and not waste it.
首先，我們應該儲存水源，不再浪費。
Second, we should protect our water resources and not pollute them.
其次，我們應該保護水資源并且不再污染它們。
Third, we should discover ways to reuse water.
第三，我們應該尋找循環利用水源的方法。
Scientists have made some progress in this field.
科學在已經在這一方面取得了進步。
Today, some large cities are reusing their water.
現在，有些大城市的水源是重復利用的。
But people's need for water is increasing day by day.
但是人類對水資源的需求量與日俱增。
We still don't have enough water.
我們依然沒有足夠的水源。
What else can we do?
我們還能做什么呢？
The sea seems to have the best answer.
海洋似乎有最好的答案。
There is plenty of water in the sea.
大海有足夠的水分。
But we need to take the salt away from the sea water.
但是我們需要把鹽從海水中分離開來。
This is very expensive.
這花費很高。
If scientists can find cheaper ways to do it, we can solve the problem of the shortage of water.
如果科學家們能找到更便宜的方法，我們就能解決水資源短缺的問題。
