acid residue

例句：

1. 1. The chemical analysis of the sample revealed a significant amount of acid residue.
   样本的化学分析显示了显著的酸性残留物。
2. 2.The factory had to be cleaned out to remove all the acid residue left behind by the previous owner.
   工厂必须被彻底清理，以清除前业主留下的所有酸性残留物。
3. 3. The acid residue from the chemical spill was hazardous and required immediate removal.
   化学泄漏产生的酸性残留物是危险的，需要立即移除。