这是混迹于这一由修道院组成的虔诚链条中仅有绝无的世俗环节。

It was the sole profane ring which was linked to that devout chain of convents.

youdao

这事绝无仅有；不会再发生了。

It was just a one-off; it won't happen again.

《牛津词典》

我记得他因为健康不佳而被迫取消的情况绝无仅有。

I can remember very few occasions when he had to cancel because of ill health.

《牛津词典》

The dollar has plummeted more in Bush's term than during any comparable period of US history.

布什执政期间，美元继续暴跌,这在美国历史上绝无仅有。

斯坦福公开课 - 经济学课程节选