The U.S. experienced an oil boom thanks to new technology -- shale drilling.

得益于新技术——页岩钻探，美国经历了石油繁荣。

In 1865 thousands of independent companies were drilling oil in Pennsylvania and there were more than two hundred which were refining the product.

1865 年， 宾夕法尼亚有数千家独立公司在开采石油， 其中有 200 多家在提炼产品。

An official report could not determine whether the oil rig had been drilling in the wrong place, or whether the maps of the mine were inaccurate.

官方报告无法确定石油钻井平台是否在错误的地点进行钻探，或者矿井地图是否不准确。