pulp density

例句：

1. 1. The pulp density of the paper is crucial for its quality.
   纸张的浆料密度对其质量至关重要。
2. 2. The pulp density affects the strength and durability of the paper.
   浆料密度影响纸张的强度和耐用性。
3. 3. The pulp density is measured by weight per unit area.
   浆料密度是通过单位面积的重量来测量的。