以下为句子列表：
英文: Analysts at Citibank reckon the oil price needs to remain above $40 a barrel to make the development of the oil sands worthwhile.
中文: 花旗银行的分析师认为只有当油价持续高于40美元一桶时，油沙的开发才变得有价值的。
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英文: But with oil selling for around $70 a barrel, and with big oil firms struggling to find new resources, the oil sands suddenly seem much more attractive.
中文: 但鉴于当下油价在70美元上下波动，而石油巨头们却苦于找不到新的资源，油沙似乎突然间变得十分的吸引。
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英文: If the price of natural gas rises, or that of oil falls, the oil sands will look less enticing.
中文: 如果天然气的价格上升，或者石油的价格下跌，油沙的吸引力将由此减低。
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英文: Saturated hydrocarbon fractions of free oil, sealing oil and bound oil, which are extracted from six oil sands of Yanchang Formation in Xifeng oilfield of northwestern Ordos Basin, Northwest China, have been analyzed by GC/MSD(6890N/5973N) in order.
中文: 摘要对鄂尔多斯盆地西峰油田三叠系延长组六个油砂样品中游离烃、封闭烃、束缚烃的饱和烃馏分进行了GC-MS分析。
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英文: Shell and other big investors in the oil sands hope to meet such requirements by siphoning off emissions from their mines and storing them underground—although the technology to do so is still in its infancy.
中文: 壳牌和其他大的油沙投资者希望把排放的污染气体从他们的矿区吸抽出来然后贮存于地下，以此满足上述的要求，但是该项技术仍然处于研究的初级阶段。
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