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Arthritis is a kind of diseases that the body joints are damaged. It is the inflammation of the joints. It can cause pain, swelling, and stiffness. It can be very painful to move the joints having arthritis. It is a chronic disease.

关节炎 是 身体关节 受损的 一种 疾病。 它是 关节的 炎症。它 会 引起 疼痛,肿胀 和 僵硬。移动 患有 关节炎的 关节 会 很痛。它是 一种 慢性疾病。