Or there may be an as yet unknown cause of cardiovascular pathology.

亦或，存在一种至今仍不为人们所知的引发心血管疾病的病因。

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Or there may be an as yet unknown cause of some cardiovascular pathology.

也可能有某种至今未知的原因导致心血管疾病。

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Chronic fatigue syndrome (CFS) : Sudden debilitating fatigue of unknown cause.

慢性疲劳症候群：不明原因的突然虚弱疲劳。

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Then on April thirtieth, two thousand seven,a huge fire of unknown cause almost completely destroyed South Hall.

VOA: special.2009.08.21

The exact cause is unknown. But in a recent study, an experimental drug showed signs of halting the disorder in laboratory mice.

VOA: special.2010.05.19

If hoarseness continues or the cause is unknown, doctors should perform an examination called a laryngoscopy.

VOA: special.2009.09.02

In other cases, vocal cord paralysis may develop from an unknown cause (idiopathic).

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"What we need looking forward is a standardized approach when you have encephalitis of unknown cause so very important things like this aren't missed, " he said.

CNN: CDC: Man died of rabies from kidney transplant

The latest version of Bear's theory, published in 2008, holds that similar protein production problems may be at play in many cases of autism of unknown cause.

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