我们无法继续建造更多的水坝，开发越来越深的地下水，而且，即使我们负担得起，这么做是不划算的方式。

We could continue to build more DAMS and exploit deeper and deeper aquifers; but even if you can afford it, it's not a cost-effective way of doing things.

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海狸常常在河流或溪流边构建水坝来协助水流向森林或流进地下水道以允许生命可在周围茂盛生长。

Often Beaver builds DAMS in rivers or streams to assist in moving the water into the forest or into underground waterways to allow life to thrive all around.

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