尽管打鼾的主要原因是肥胖，具体成因却一直没有被完全知晓。
Though a major risk factor is obesity, the exact cause is not fully understood.
具体是什么原因造成的脓肿、或者说病情到底有多么严重，目前还没有透露。
Quite what caused the abscess, or exactly how severe it was, has not been revealed.
具体的原因还没有找到，但报告还是给出了一些解释。
Exactly why is not known, but the authors offered several explanations.
具体的原因还没有找到，但报告还是给出了一些解释。
Exactly why is not known, but the authors offered several explanations.
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