At the same time, the U.S., having edged closer to energy independence with natural gas and oil shale, no longer needed Riyadh the way it once did, and was noticeably less attentive.

与此同，天然气和油页岩的开采，美国已经逐渐接近能源独立，已经不再像过去那样需要利得了，对沙特也明显不那么在意了。

And that's a level that doesn't allow US oil shale producers to make a lot of profit and incentivise extra drilling for the new oil and gas reservoirs that they need to boost production.

而这个价格水平不足以让美国页岩油获得大量利润，也不足以激励他们为需要增加量的新油气储层进行额外钻探。