What a mystery? WHO could have possibly done this?

真是个谜团啊？有可能是谁干的？

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What happened to them remains somewhat of a mystery.

他们到底出了什么事，到现在仍可以说是个谜。

《牛津词典》

The reason for what follows remains a mystery for zoologists and naturalists.

接下来发生的事情的原因对于动物学家和自然学家来说仍然是个谜。

youdao

The H1N1 virus, which is commonly known as swine flu, has spread rapidly around the world since emerging in North America earlier this year, yet still much of what makes it so potent a threat remains a mystery.

VOA: standard.2009.08.25

Consciousness, if what we mean by consciousness is this qualitative aspect of our mental life, consciousness remains a pretty big mystery.

如果我们所说的意识,就是指我们心理活动定性的方面,那么意识还是一个很大的谜团

耶鲁公开课 - 死亡课程节选

What he sees is a mystery.

他的所见所知,就像是一个谜。

耶鲁公开课 - 1945年后的美国小说课程节选

What remains a mystery is how gamma rays are created at such extraordinary energies.

BBC: Blazar Markarian 421's flare-up is cosmic coincidence

Scores of books explain masculine ways of thinking and behaving so women can understand what might otherwise remain a mystery.

FORBES: Stanford Finds The Secret Switch For Women's Success!

Recording her verdict after a week-long hearing, coroner Caroline Beasley-Murray said that what happened to Mr Lubbock remained a mystery.

BBC: NEWS | UK | England | Essex | Police reject Barrymore claims