其研究者们改变了这些所谓能量作物的基因，以牺牲其如纤维素这样的碳水化合物为代价，来提高它们木质素的含量。
Its researchers have fiddled with the genes of these so-called energy crops to increase the amount of lignin in them, at the expense of carbohydrates like cellulose.
虽然那些组成植物茎干纤维素和木质素的分子不能为酵母所消化，但是某些细菌和其他种类的真菌可以完成这项任务。
Although yeast cannot digest cellulose or lignin, the molecules that form a plant's skeleton, some bacteria and other species of fungi are able to do the job.
除了纤维素，还有半纤维素和木质素。
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