joint disease

例句：

1. 1. He hasbeen suffering from joint pain for the pastfew months.
   他过去几个月一直遭受关节疼痛。
2. 2. The doctor diagnosed him with osteoarthritis of his knee.
   医生诊断出他的膝盖患有骨关节炎。
3. 3. Rheumatoid arthritis is a chronic autoimmune disorder that affects many people.
   风湿性关节炎是一种慢性自身免疫疾病，影响许多人。