It 's a mystery how they have finished the work so quickly.

他们如何这么快地完成了工作真是不可思议。

youdao

WOMAN: No, you can"t, it"s impossible. It"s a beautiful mystery, isn"t it?

看不出来的，这是不可能的事。既美丽又神秘，对不对?。

youdao

Mystery Man: It "s been a pleasure talking to you."

神秘人：跟你谈话很高兴。

youdao

Stuttering's cause has long been a mystery, but it has frequently been diagnosed as a psychological problem.

VOA: standard.2010.02.11

No mystery about what it's like to be a ball point pen.

变成圆珠笔本身并没有什么神秘的。

耶鲁公开课 - 死亡课程节选

No mystery about what it's like to be a cell phone.

作为手机也一样。

耶鲁公开课 - 死亡课程节选

And it's a mystery novel, it's a race novel, it's got a lot of humor in it.

NPR: Grigsby Bates on Her New Mystery Novel

It's just a mystery to me that it's taken a civilised society so long to bring in a law which protects those of us who care about our health, as opposed to those who indulge in the disease-sticks.

BBC: Non-smoker

It's unexplainable how flat the whole thing looked for the whole game, it's a mystery for me.

BBC: Arsene Wenger laments 'poor performance' by Arsenal