According to the EPA, ethanol produced from corn at a modern refinery powered by biogas can represent a 20 percent greenhouse gas reduction compared with regular gasoline.
据美国环保署说，与普通汽油相比，在一个靠沼气发电的现代炼油厂使用玉米提取的乙醇能使温室气体排放降低20%。
But I hope to learn about modern refinery systems, too.
同时也希望能学到现代炼油的方法。
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