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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The cytoplasm and intercellular fluid can be extracted from enzyme hydrolyzed cellulosic material and pectin, then the laminarin can be obtained via separation and purification.

应用酶解技术将纤维质和果胶质水解，提取出细胞质和细胞间液，再经分离纯化可提取海带多糖。

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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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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?