Bell's palsy occurs when there's a disruption of the facial nerve from an unknown cause.

贝尔麻痹发生于面神经受损，且原因不明。

Ghanaian observers say the man has since died from unknown causes. The victim was an American citizen.

加纳观察员称后因不明疾病死亡，这位患者是一位美国公民。

About 1.6 million Americans have type 1 diabetes, an autoimmune disease of unknown cause that requires lifelong insulin shots.

美国近160万人患有1型糖尿病，这是一种自身免疫病，病因未知，这种病需要终身注射胰岛素。

Additionally, a new debilitating neurological condition with an unknown cause has afflicted more than a dozen panthers, alarming conservationists.

此外，有十几只美洲狮为一种新的神经疾病所苦，疾病原因不明，但会导致行动不便，这也让保育工作者深感忧虑。

That's where it's good to look for early lesions which are often red or white plaques with an unknown cause.

这会便于发现早期病变，病损通常是不明原因导致的红色或白色斑块。

In 1960, a Utah man by the name of Roscoe Nelson, a father of six, died suddenly of unknown cause.

1960年，犹他州一名名叫罗斯科·纳尔逊（Roscoe Nelson）的男子，他是六个孩子的父亲，突然死于不明原因。

To admit this view is, as it seems to me, to reject a real for an unreal, or at least for an unknown cause.

承认这种观点， 在我看来，就是为了不真实的， 或者至少是出于未知的原因而拒绝真实的。

The child appears to have lived for around six to nine more years after losing the limb, eventually dying from unknown causes as a young adult, researchers said.

这个孩子在截肢后似乎又活了大约6到9年，最终在青年时因不明原因死亡，研究人员说道。