Because crude oil (which can be refined into other products, such as petroleum or jet fuel) is only a few molecular stages removed from the fatty acids normally excreted by years or E. coli during fermentation, it does not take much fiddling to get the desired result.
【正确答案】：由于在酵母或大肠杆菌发酵时通常所分泌的脂肪酸中提取原油（可精炼为其他产品，例如汽油或喷气发动机燃料）只需几个分子转换步骤就能完成，所以不需要做很多加工就可以得到理想的结果。
