The motive for the killing is unknown.
杀人的动机不明。
The immediate cause of death is unknown.
造成死亡的直接原因不明。
Unknown attackers riddled two homes with gunfire.
不明来路的袭击者用枪把两座房屋打得千疮百孔。
Ignorance of people brings fear, fear of the unknown.
人的无知带来了恐惧，对未知事物的恐惧。
A previously unknown extremist group has said it carried out Friday's bomb attack.
一个先前未知的极端分子组织声称其实施了周五的炸弹袭击。
She had known Max for some years now, but he was still pretty much an unknown quantity.
她现在认识马克斯也好几年了，但是他仍然是个大大的未知数。
它黑暗而未知。
His whereabouts have been utterly unknown so far.
迄今他的下落全然未知。
I remember the fear and the panic of the unknown.
我记得那种对未知的恐慌感。
It urges us to explore the unknown domain of the universe.
它促使我们去探索宇宙的未知领域。
The author does imply this by talking about unknown species.
作者确实通过谈论未知物种暗示了这一点。
In Juan's world, the unknown and undiscovered was vast and marvelous.
在Juan的世界里，未知和未被发现的东西是广阔而不可思议的。
Bass may have perished there after years of wearisome and unknown labour.
男低音也许是在多年的劳累和默默无闻的劳动之后，才在那里绝迹的。
The man's identity remains unknown.
这名男子的身份还是个谜。
他是个没有名气的作家。
The fate of the three men is unknown.
这三个人命运未卜。
The authorship of the poem is unknown.
这首诗的作者不详。
A young unknown played the leading role.
演主角的是一个名不见经传的年轻人。
The author is virtually unknown outside Poland.
在波兰以外，这位作者实际上鲜为人知。
An unknown number of demonstrators were arrested.
不知多少示威者被逮捕了。
Retailers are taking no chances on unknown brands.
零售商们不在无名品牌上冒险。
Unknown to me, he had already signed the agreement.
他背着我已签了协议。
The letter had come from an unknown mischief-maker.
这封信来自一个匿名的离间者。
The verdict was murder by a person or persons unknown.
裁断是一人或多人谋杀，凶手身份未明。
The contract was awarded to a previously unknown company.
该合同给了一家先前不知名的公司。
He was trying, for some unknown reason , to count the stars.
不知何故，他试图数星星。
A hundred years ago coronary heart disease was virtually unknown in America.
100年前，冠心病在美国几乎从未有过。
Thanks to the automobile, Americans soon had a freedom of movement previously unknown.
由于有了汽车，美国人很快就获得了前所未有的行动自由。
Observe the unknown around you.
观察你周围的未知事物。
Luckily, our brains become stronger when meeting the unknown.
幸运的是，我们的大脑在遇到未知事物时变得更加强大。
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