lignin number

例句：

1. 1.The wood was analyzed to determine its lignin content.
   对木材进行了分析，以确定其木质素含量。
2. 2.The lignin content in the wood is an important factor in determining its strength and durability.
   木材中木质素的含量是决定其强度和耐久性的重要因素。
3. 3. In order to improve the quality of wood products, it is necessary to reduce the lignin content in the raw materials.
   为了提高木材制品的质量，有必要减少原料中的木质素含量。