即使矿源比承租人预测的要少，或者矿源是不可开采的形式，这也是不可退还的。
This is nonrefundable, even if the source of the mineral is less prevalent than the lessee predicted it to be or if it is in an unextractable form.
它们对资源的大量开采可能耗尽或不可逆转地破坏森林、土壤、水、空气和气候。
Their surging exploitation of resources threatens to exhaust or unalterably spoil forests, soils, water, air and climate.
西方森林面积的快速增长似乎同其他各地的森林开采速度一样不可阻挡。
The growth of Western forests seems almost as unstoppable as deforestation elsewhere.
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