impurity conductivity

例句：

1. 1. Thewater was so dirty that it made thechildren sick.
   水太脏了，让孩子们生病了。
2. 2. The food was contaminated with bacteria.
   食物被细菌污染了。
3. 3.The company's product is known forits high purity.
   该公司的产品以其高纯度而闻名。