安哥拉卡瓜科市目前正在爆发一种病因不明的疾病。
An outbreak of a disease of unknown etiology is currently ongoing in Cacuaco municipality, Angola.
类风湿关节炎是一种病因不明的自身免疫性疾病，多发于中年女性，由于病因病机复杂，尚无根治之法。
Rheumatoid arthritis is an unknown etiology autoimmune diseases, multiple middle-aged women, the cause of the disease complicated machine, no cure for the problems.
原发性硬化性胆管炎是一种病因不明的少见疾病。
Primary sclerosing cholangitis (PSC) is a rare disease of uncertain origin.
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