rate of sulphur expulsion

例句：

1. 1. Therate of sulphur emissions has beenincreasing in recent years.
   近年来，硫磺排放率一直在增加。
2. 2. The study aims to determinethe optimal rate of sulphurdioxide removal.
   该研究旨在确定最佳的二氧化硫去除率。
3. 3. Thecompany's policy onenvironmental protection is to reduce therate of pollution as much as possible.
   该公司的环保政策是尽可能减少污染率。