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。
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。
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。
Why this pigment is there and what it might do was unknown.
这种色素为什么会存在和它可能有什么作用是未知的。
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。
This spaceship is about to start an exciting voyage into an unknown world.
这艘宇宙飞船即将开始一趟振奋人心的未知世界之旅。
A little bravery can result in the possibility of success when confronted with something unknown.
当面对一些未知的事情时，拿出一点勇气就有可能带来成功。
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。
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。
Nobody wants to be old, unknown and poor.
没有人愿意变老、变得无人问津，也不想变得贫穷。
Silently, he let himself go into the unknown.
他默默地走进未知的世界。
Being my mistake or being still yours is unknown.
不知道是我的错，还是你的过。
What she wants is unknown, but she always comes back.
她想要什么不得而知，但她总会回来的。
It is still unknown how the universe came into existence.
人们仍然不知道宇宙是如何形成的。
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