And then another six can be made robustly, competitively, from cellulosic ethanol and a little bio-diesel, without interfering at all with the water or land needs of crop production.
接着，汽油中的一半可以用有强劲竞争力的 纤维素乙醇和少量的生物柴油来代替， 它们是用水和粮食造的，绝对没有问题。