Furthermore, ethanol requires a tremendous amount of fossil fuels to produce. The net energy gain is not terribly high.
此外乙醇的制造得耗用大量石化燃料，两相抵扣之后、我们最后得到的干净能源量其实并没那么高。
Energy efficiency (net energy gain or energy ratio) of corn-based ethanol as a substitute for fossil fuel is an important criteria for assessing its sustainability.
玉米燃料乙醇作为化石燃料的替代品，能量效率(净能量或能量比)是评价其可持续性的一个重要标准。
Energy efficiency (net energy gain or energy ratio) of corn-based ethanol as a substitute for fossil fuel is an important criteria for assessing its sustainability.
玉米燃料乙醇作为化石燃料的替代品，能量效率(净能量或能量比)是评价其可持续性的一个重要标准。
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