地球上的自然资源是有限的，所以人们应该明智地利用它们。
Natural resources on the Earth are limited, so people should use them wisely.
物质循环、再生利用的生态学原理是自然资源和环境从有限到无限的生命原则。
Circulating and regenerating mechanism make the natural resources from finite to infinite and it is the life rule for ecosystem.
磷是一种不可更新、难以替代的有限自然资源。
Phosphorus and its compounds are non renewable and non replaceable limited resources.
磷是一种不可更新、难以替代的有限自然资源。
Phosphorus and its compounds are non renewable and non replaceable limited resources.
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