其中一种生活在五英里深的南非黄金矿脉里。
One type lives five miles deep in the bowels of South African gold mines.
他们快要挖到金矿脉的尽头了，然而那儿却没有金块。
They had come to the end of the rainbow, and the pot of gold was no longer there.
本文主要论述了倾斜极薄岩金矿脉采矿方法的优化途径。
The approaches to optimization of mining method for inclined and extra-narrow gold ore vein are described in this article.
应用推荐