degressive cost

例句：

1. 1. The population of the city has been degressive in recent years.
   近年来，该市的人口一直在减少。
2. 2.The economy is degressive, and it's hard to see a bright future.
   经济正在递减，很难看到光明的未来。
3. 3.The company's profits have been degressive for several quarters now.
   这家公司的利润已经连续几个季度都在下降。