逐步降级

例句：

1. 1. The quality of the product has been steadily degrading over the years.
   产品的质量多年来一直在稳步下降。
2. 2. The company's reputation is slowly degrading due to poor management practices.
   由于管理不善，公司的声誉正在逐渐恶化。
3. 3. The economy is gradually degrading as the population grows older and wealthier.
   随着人口增长和财富增加，经济正逐渐退化。