This occurs because your immune system mistakenly starts attacking the linings of your joints, making them inflamed.
发生这些症状的原因是，你的免疫系统错误地开始攻击关节内部，使其发炎。
This occurs because your immune system mistakenly starts attacking the linings of your joints, making them inflamed.
发生这些症状的原因是，你的免疫系统错误地开始攻击关节内部，使其发炎。
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