Such cases of unexplained hepatitis are not new.

这类原因不明的肝炎病例并不新鲜。

Who for some unexplained reason, was nicknamed Goofy.

不知什么原因，他被昵称为谷飞。

It causes fever, weakness, vomiting and unexplained bleeding.

该病毒会引起发烧、虚弱、呕吐和原因不详的出血等症状。

However, the attacks remain largely unexplained.

然而，这些袭击在很大程度上仍未得到解释。

Uh, it's still an unexplained death right now.

我们只是想要多了解一下薇姬。

But that unexplained little act of friendliness was all that I needed.

但我所需要的就是这种莫名其妙的小小的友好举动。

All those mythical vanishings happened under unknown and unexplained circumstances.

发生的所有这些神秘消失事件都原因不明且无法解释。

The same unexplained ailment affected a number of Americans in Cuba last year.

去年在古巴也出现了类似疾病，但原因无法解释。

The suspension came after a patient in the study had " unexplained illness" .

研究中，一名患者出现" 无法解释的疾病" ，试验因此叫停。

They had 28 samples from children in the Netherlands with unexplained respiratory infections.

他们从荷兰患有不明原因呼吸道感染的儿童身上采集了28个样本。