The technology of undersea mining was then undeveloped . 那时候深海采矿技术还不成熟。
Large mining equipment cannot be operated on narrow benches . 大型采矿设备不能在窄台阶上操作。
In england he had seized a great mining corporation without investing a shilling . 在英国,他没有投资一个先令,居然把一家规模宏大的采矿公司弄到了手。
Unfortunately, though, he became involved in a dubious mining venture in which several british acquaintances lost heavily . 不幸的是,他同一个可疑的采矿生意有牵连,使几个英国朋友着实破了钱财。