“sludges”造句，怎麼用sludges造句

Phosphorus fractionation is important too in understanding the biological phosphorus removal process and possibilities to recover phosphorus from sludges.

The sewage sludges can be used as amendments on crop land.

The results show that the wastewaters and sludges from two factories are most toxic and can cause serious damage to rice seedlings, and those from other two factories can also cause damage.