其病因不明，也无适当的治疗。
The aetiology was obscure and the appropriate treatment debatable.
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.
何种病因不明的晕厥发作后病人应收入院治疗?。
Who should be admitted to the hospital after an episode of syncope of unclear cause?
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