在人类社会，地球生存资源有限，分布不均匀。
In the human society, the earth's survival, uneven distribution of limited resources.
水不仅是宇航员在月球上的重要生存资源，还是月球基地所需氧气和运载火箭燃料的来源。
Water is not only used as a key ingredient of human subsistence but also a source of oxygen and rocket fuel necessary for the human lunar bases.
南非有五分之一的水生物种濒临灭绝，数百万的南非人可能会丢失一种生存资源的关键来源。
Millions of Africans may lose a key source of livelihoods as a fifth of freshwater African species are threatened with extinction
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