截止到19世纪60年代早期，这些冒险者为寻找“黑色的金子”钻探遍了整个宾西法尼亚西部。
By the early 1860's these wildcatters were drilling for "black gold" all over western Pennsylvania.
如果你在沙砾中加上撒上盐，把它晃一晃，那些黑色的小球中就会显现出不易发现的小块金子。
If you salt the slurry with buck shot and swirl the pan around, the dark pellets will track the elusive flecks of gold.
如果你在沙砾中加上撒上盐，把它晃一晃，那些黑色的小球中就会显现出不易发现的小块金子。
If you salt the slurry with buck shot and swirl the pan around, the dark pellets will track the elusive flecks of gold.
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