diminish rates on cost method

例句：

1. 1. The population of the city has dimmed significantly over the past decade.
   过去十年里，这个城市的人口显著减少。
2. 2.The company's profits have been diminishing due to increased competition.
   由于竞争加剧，公司的盈利一直在减少。
3. 3.The amount of water used in agriculture has been diminishing due to conservation efforts.
   由于节水措施，农业用水量正在减少。