When the price of crude oil goes through one of its periodic downturns, as it is doing now, it sends a shiver through the oil industry. History promises that higher prices will return. Until then, US shale companies are under severe pressure and big oil companies wonder about the viability of new projects.
當原油價格經歷某一輪周期性低迷（就像現在這樣）時，它讓整個石油行業感受到寒意。歷史告訴我們，價格將再度上漲。在那之前，美國頁巖企業面臨巨大壓力，而大型石油公司開始懷疑新項目的可行性。
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