从水循环的角度来讲，地球上的总水量是不变的，因此地球上可供人类使用的水是取之不尽的。

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国家开放大学 / 人类发展与环境保护

从水循环的角度来讲，地球上的总水量是不变的，因此地球上可供人类使用的水是取之不尽的。
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人类发展与环境保护

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