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.
丹麦自然资源匮乏，生产能力有限；未来它在欧洲将成为一个经纪人、银行家和商品经销商。
Denmark has few natural resources, limited manufacturing capability; its future in Europe will be as a broker, banker, and distributor of goods.
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.
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