Cellulose is the major constituent of plant cell walls.
纤维素是植物细胞壁的主要成分。
It is important in the deg radation of plant cell walls in living plants ( e. g . in leaf abscission )
在生活植物体的细胞壁的降解过程中起重要的作用（如叶子脱落） 。
About 90 percent of the weight of old paper is cellulose, the sturdy material that makes up plant cell walls.
旧纸张重量的约90%来自纤维素，这是构成植物细胞壁的坚固材料。
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