chemical oxygen consumption

例句：

1. 1. The wastewatertreatment plant needs to monitor the chemical oxygenconsumption of the wastewater.
   废水处理厂需要监测废水的化学需氧量。
2. 2.The chemical oxygen consumption of the industrial wastewater is high, which affects the environment.
   工业废水的化学需氧量很高，这影响了环境。
3. 3. The chemical oxygen consumptionof the wastewater treatment plant is akey indicator for monitoring its efficiency.
   废水处理厂的化学需氧量是监测其效率的关键指标。