degenerative disease

例句：

1. 1. The patient's symptoms worsened over time, indicating a degenerative disease.
   患者的病情随着时间的推移恶化，表明患有退行性疾病。
2. 2. Researchers have been studying the mechanisms behind degenerative diseases for decades.
   研究人员已经研究了退行性疾病背后的机制几十年了。
3. 3.The elderly often suffer from degenerative diseases that can lead to serious health problems.
   老年人经常患有退行性疾病，可能导致严重的健康问题。