除了纤维素，还有半纤维素和木质素。
草、树和其他生物基原料是由纤维素、半纤维素以及维持植物外形的木质素组合而成的。
Grass, trees and other biomass feedstocks consist of a mixture of cellulose, hemicellulose and lignin, a tough material that helps plants keep their shape.
纤维素、半纤维素可用来生产燃料酒精，而木质素往往被废弃。
Cellulose and hemicellulose could be used to produce fuel alcohol. However, lignin is often regarded as uselessness.
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