reduce the speed

例句：

1. 1.The population of the city is expected to reduce by 20% in the next five years.
   预计该市的人口在接下来的五年内将减少20%。
2. 2. The cost of living in this area has been reducing steadily over the past decade.
   过去十年里，这个地区的生活成本一直在稳步下降。
3. 3.The company plans to reduce its carbon footprint by using more renewable energy sources.
   该公司计划通过使用更多的可再生能源来减少其碳足迹。