For oil replacements, cheap suddenly looks less of a problem.
对于石油的替代品来说，价格突然不是什么问题了。
Oil is the biggest single energy source and replacements for the energy-dense, easily transported fuel are hard to find.
石油是最大的单一能源和替代品，因为高能量且容易运输的燃料太难找寻。
Oil is the biggest single energy source and replacements for the energy-dense, easily transported fuel are hard to find.
石油是最大的单一能源和替代品，因为高能量且容易运输的燃料太难找寻。
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