名詞 lignin:

1. a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants

lig.nin

n.（名詞）
A complex polymer, the chief noncarbohydrate constituent of wood, that binds to cellulose fibers and hardens and strengthens the cell walls of plants.
木質(zhì)素：一種復(fù)雜聚合物，是木頭非碳水化合物的主要組成物，作用是凝聚纖維素并增強(qiáng)細(xì)胞壁的強(qiáng)度