If the copper prices we pay are not at the international level, our sales will drop, and then the demand for US copper will go down.
如果我们购买的价格不能维持在国际水平,我们的销售量就会下降,从而引起美国的铜矿需求下降。
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There has also been a surprise drop in the fees charged by smelters and refiners to process dry feedstock, or copper concentrate as it is known, into anodes and eventually cathodes.