This Firefox crop circle sprouted up in a corn field in Oregon, but its origins are no mystery.

在俄勒冈州的麦田里出现了这个火狐麦田圈 但其来源并不神秘。

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It appears that the butter was contaminated by the PBDE from its paper wrapping, but how the chemical got into the packaging is a mystery-and of great concern.

看上去这些奶油是被它的纸质包装上的PBDE污染的，但是这些化学物质是怎么进入到包装内部却不得而知——但已经足以让人担忧。

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But for all its enigmatic qualities the book leaves an empty feeling, with the unexplained mystery of the sleeping Eri a particular source of frustration.

然而除了这些迷离的特征，本书给人们留下一种虚无的感觉，且本书对于沉睡的爱丽未作任何解释，这也令人不安。

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Cupid confirmed that it does employ a "motivation team", but said its activities included mystery shopping, site monitoring and moderation of chat rooms and forums, not enticing "paying subscribers to renew".

BBC: Dating firm Cupid rejects 'fake profiles' allegations

But its genetic origins remained shrouded in mystery until 1995, when French researchers pinpointed a gene on chromosome 5 that was missing or defective in 98% of those afflicted.

FORBES: For Arya

But even with highlights such as these to give shape to her closet, its full extent remains a mystery.

WSJ: Anna Piaggi's Costume Drama