chlorine number

例句：

1. 1. The water in this area has a high chlorine number because of the nearby river.
   这个地区的水因为附近的河流而含有较高的氯。
2. 2.The food industry uses chlorine numbers to ensure the safety of their products.
   食品工业使用氯含量来确保他们产品的安全性。
3. 3.The chlorine number is an important factor in determining the suitability of a water source for irrigation.
   氯含量是决定水源是否适合灌溉的重要因素。