While some struggle to create new lives on the Frontier, others are rewarded with riches on a scale never seen before, as the world rushes in to mine California's gold.
当这个世界陷入加利福尼亚金矿开采热时，一些人正竭力在边境创造新的生活时，另外一些人则在很大程度上拥有了前所未有的财富。
The mine subsidence disaster discipline is the frontier crossing branch of science among geology, ecology, mining, rock soil mechanics, information science, management science and sociology.
矿山沉陷灾害科学是地质学、生态学、采矿学、岩土力学、信息科学、管理科学和社会学之间的交叉边缘学科。
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