这位石油勘探者决定在沙漠边缘钻探，尽管那里从未发现过油田。

The ___wildcatter decided to drill at the edge of the desert where no oil had ever been found.

那位石油大亨以高风险投资著称，是个真正的冒险家。

The oil tycoon, known as a ___wildcatter, is famous for his high-risk investments.