refining expense
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把焦油沙转换成原油不仅费用昂贵而且对环境造成污染。 当油价在60-85美元范围波动或允许再高一点,这种提炼过程才有利可图。
Transforming tar sands into crude is costly as well as dirty: the process only becomes profitable with oil prices in the $60-85 range or higher.
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