The second generation of biofuels converts biomass or cellulosic material from grass, corn cobs and stover, trees or waste into ethanol.

第二代生物燃料原料改成采用生物量或者从草中提炼的纤维材料、玉米穗轴和干草、树木或者废弃物来提炼乙醇。

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Advanced biofuels from cellulosic material - plant waste and wood - are better, because they don't compete directly with food, but they still need reasonably fertile land in which to grow.

来自纤维素质的先进生物燃料-植物废物和木头-更好，因为他们不直接同食物竞争，但他们仍然需要适度肥沃的土地来生长。

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Alternatively, the fibrous web material may include an effective amount of natural cellulosic fibers.

另一种可选择的方法是可在纤维织物材料中加入有效量的天然纤维素纤维。

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Mr. DOUGLAS FAULKNER (Principal Deputy Assistant Secretary, Department of Energy): We think in six years, we can bring down the cost of ethanol from cellulosic material, to be cost competitive with gasoline.

NPR: Canadian Dreams of Ethanol Distilled from Grass

"It's not our long-term solution because of the competition with feed, and fuel competition, but it is prompting us to put into place a refueling infrastructure that could be used with cellulosic ethanol, " made from other types of plant material such as timber waste or switch grass.

CNN: Ethanol: Is it friend or foe?