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.
该疾病确切地病因不明，但人们认为可能是内在代谢缺陷所造成的。
The exact cause of cerebellar abiotrophy is not known, but it is thought to be due to an intrinsic metabolic defect.
目的查找某中学不明原因疾病可能的病因及其主要的危险因素，为制定现场控制措施提供依据。
To seek for the possible causes for an unknown disease and its risk factors and provide basis for establishing control measures on site.
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