impurity

例句：

1. 1.The food was contaminated with impurities from the factory.
   食物被工厂的杂质污染了。
2. 2. The water is too polluted to drink.
   水太污染了，不能喝。
3. 3. The soil is not pure enough for growing crops.
   土壤不够纯净，不适合种植作物。