n.木质化，木化

degree of lignification → 木质化程度
Si-lignification compounds → 硅质
perennial lignification herb → 多年生木质化草本
Peel Lignification → 果皮木质化
shoot lignification → 枝条木质化
half lignification → 半木质化
cell lignification → 细胞木质化
lignification of pulp → 果肉木质化
lignification of scions → 木质化程度

1.This lignification serves to stiffen and strengthen the cells.
[汉]木质化足以使细胞变硬和增强。