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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如果他们真心诚意，却也全是因为他们相信他们必须要为一个水资源和其他天然资源日益枯竭的地球做好未来的打算。

But if they are sincere, it is probably because they believe they must plan for a world in which water and other natural resources are increasingly scarce.

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虽然美国某些地方天然含有硬水资源，但并不是全美所有地方都有硬水分布。

And while hard water occurs naturally in some parts of the country, it's by no means found in all of them.

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