Nasa has been so keen to find water on the Moon because it brings the dream of a permanent lunar base one step closer.

美国宇航局一直渴望能够在月球上发现水，因为这样，月球变成一个永久性基地的梦想又近了一步。

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This settlement - which could be available by 2030 - would be built using natural resources from the lunar surface to create a permanent base for the purpose of science, business, and even tourism.

这个开拓地——有可能在2030年前可供使用——将利用来自月球表面的自然资源进行建设，为科学、商业甚至是旅游业提供永久性的基地。

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NASA, for example, recently announced plans to return by 2020, eventually building a permanent base on the lunar surface.

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