这是因为地球的人口迅速增加，很快仅仅依靠陆地不可能给人类提供足够的食物了。
This is because the population of the earth is increasing so fast that very soon the land alone will not be able to provide enough food for everybody.
这是因为地球的人口迅速增加，很快仅仅依靠陆地不可能给人类提供足够的食物了。
This is because the population of the earth is increasing so fast that very soon the land alone will not be able to provide enough food for everybody.
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