dilution of sewage

例句：

1. 1.The water was diluted with salt to make it taste better.
   水被加盐稀释，味道更好了。
2. 2.The doctor diluted the medicine with water before giving it to the patient.
   医生在给病人用药前，用水将药液稀释。
3. 3. The scientist diluted the sample to test its purity.
   科学家将样本稀释以测试其纯度。