kraft lignin

例句：

1. 1. The kraftlignin is used in the productionof paper.
   纸浆用于造纸生产。
2. 2. Thepulpwood is a renewable resource that canbe used to produce paper.
   木浆是一种可再生资源，可以用来生产纸张。
3. 3. Thekraft lignin is also usedas a raw material for other products.
   纸浆还被用作其他产品的原料。