dissolved oxygen and chlorine ion

例句：

1. 1. The water was so polluted that it had to be discarded.
   水被污染到了必须丢弃的地步。
2. 2. The chemical reaction between the two substances is known as a neutralization reaction.
   这两种物质之间的化学反应被称为中和反应。
3. 3.The doctor used a syringe to inject the solution into the patient's vein.
   医生用注射器将溶液注入患者的静脉。