但是，我们的水资源是有限的。
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.
地下水资源储量对某一地区是一定的，亦是有限的。
The reserves of underground water resources are certain and limited at some area.
只有十分有限的淡水资源是可用于人类。
Only quite limited fresh water resource is available to human beings.
只有十分有限的淡水资源是可用于人类。
Only quite limited fresh water resource is available to human beings.
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