由于磷矿的开采和磷在自然界中近乎单向循环，磷资源日益枯竭。

Owing to the exploitation of phosphorite and phosphorus's unilateral cycle in nature, phosphorus resource is increasingly exhausted.

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被开采利用的自然资源在进入人类社会之后，最终以废弃物和垃圾的形式停滞下来，人类社会因而形成了一种“资源—产品—废弃物”的单向经济模式。

After these natural resources are exploited, they become waste or rubbish at last. As a result, there forms a liner economy pattern of "resource-product-waste" in human society.

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