这些储备被开采完之后，大型开采公司又到其他国家寻找类似的储备。
As these supplies were used up, big drillers looked for similar formations in other countries.
如今新开发的铜矿还不多，而随着旧铜矿开采的深入，上等品级的矿石已逐渐开采完，矿石品级已不如从前。
As older mines get deeper and the choicest parts of deposits become exhausted, ore grades have declined.
我们手头上所使用、食用的任何一样东西都是直接或者间接牵涉到它，但它不是永无休止的，终有一天它们会被开采完。
We have used, eat anything are directly or indirectly involved in it, but it is not endless, one day they will be mined.
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