lignin

例句：

1. 1. The wood is made up of differenttypes of lignin and cellulose.
   木头由不同类型的木质素和纤维素组成。
2. 2. The process of removing ligninfrom wood is called pulping.
   从木头中去除木质素的过程称为漂白。
3. 3. Lignin is a natural polymer that giveswood its strength and durability.
   木质素是一种天然聚合物，赋予木头强度和耐用性。