residues of chlorinated pesticides

例句：

1. 1.The soil still contains some residues of the old plants.
   土壤中仍然残留着旧植物的痕迹。
2. 2. The chemical analysis revealed several residues of the pollutants in the water.
   化学分析显示，水中含有几种污染物的残留物。
3. 3. The leftovers from the meal were left on the table as a reminder of what we ate.
   餐后的剩余食物被放在桌子上作为我们吃的东西的提醒。