degenerative pannus

例句：

1. 1. The patient's condition worsened significantly after the surgery.
   手术后，患者的病情明显恶化。
2. 2. The research suggests that aging is a natural process leading to degenerative changes in thebrain.
   研究表明，衰老是一个导致大脑退行性变化的自然过程。
3. 3. The scientist discovered a new mechanism responsible for the degenerative process of the disease.
   科学家发现了一种新的机制，负责该疾病的退行性过程。