a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants
lignin详细解释
lig.nin
n.（名词） A complex polymer, the chief noncarbohydrate constituent of wood, that binds to cellulose fibers and hardens and strengthens the cell walls of plants. 木质素：一种复杂聚合物，是木头非碳水化合物的主要组成物，作用是凝聚纤维素并增强细胞壁的强度
