And fracking has unleashed a flood of oil formerly trapped in shale rock underneath North Dakota, among other places.

液压破碎法将北达科他州及其他地区页岩下的石油大量开采出来。

It was conquered by wildcat frackers, who came up with clever ways of horizontal drilling and releasing oil trapped in the rock formations.

它被野猫压裂者征服了，他们想出了水平钻井和释放岩层中困油的巧妙方法。