据认为，地球上的水资源是有限的。
It is believed that the water resources on the earth are limited.
地球上的水资源虽然丰富，但可利用的淡水却很少。
Though the water resources are rich on the earth, the fresh water available is little.
大气层把地球上的热量和水资源从一个地方移动到另一个地方。
The atmosphere moves heat and water from place to place on Earth.
地球上可供开采的天然水资源是十分有限的。
Natural water resources that can be exploited in the earth are extremely limited.
地球上可供开采的天然水资源是十分有限的。
Natural water resources that can be exploited in the earth are extremely limited.
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