bromine index

例句：

1. 1. The bromine index of the water is low, indicating that it has a high level of chlorine.
   水的溴指数低，表明氯含量高。
2. 2.The bromine index of the soil is an important indicator of its fertility.
   土壤的溴指数是衡量其肥力的重要指标。
3. 3. The bromine index can be used to assess the environmental impact of industrial activities.
   溴指数可以用来评估工业活动对环境的影响。