也许,我应在我的文章中更清楚地说明,写就那篇文章的目的不是对不同的采矿方法的矿石成本进行对比。创造一种新的采矿方法,或改变现有的采矿方法,是一件十分复杂而困难的事。当然,那篇文章所建议的采矿方法,并不能适用于所有矿山。该文的主要宗旨不过是说明并讨论将来采用更便宜的地下开采法在技术经济上的可能性而已。 Perhaps, I should state more clearly in my essay that the purpose of writing that essay is not to compare the ore costs of different mining methods. Creating a new mining method or changing existing mining methods is a complex and difficult task. Of course, the mining method proposed in that article does not apply to all mines. The main purpose of this paper is to explain and discuss the technical and economic feasibility of using cheaper underground mining methods in the future.