But much of that new output, and most of the reserve capacity, is in the form of heavier oils that are costlier to refine and for which there is less thirst.
英
美
释义
然而,多数新增的石油产量和大多数石油储备容量则是以更为昂贵的”重油”的形式出现,而”重油”的提炼成本较贵,需求量也并非很高。
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