n. 生物固体（从处理过废水中取得的固体或半固体材料, 常用作肥料）
1. Biosolids are often used as fertilizer in agriculture.
生物固体常被用作农业中的肥料。
2. The treatment of sewage produces biosolids that can enhance soil quality.
污水处理会产生生物固体，这可以提高土壤质量。
3. Many cities recycle biosolids to reduce waste and improve sustainability.
许多城市回收生物固体，以减少废物并提高可持续性。