未知

His whereabouts have been utterly unknown so far.

迄今他的下落全然未知.

The gap between the now knowable and unknowable is vast.

现已知与未知之事间的距离极大.

His greatest danger now lies in the unknown denizen of the water.

现在他最大的危险是未知的水中居住者。

It is related to it in some direct but unknown fashion.

它们之间有某种直接的但是形式未知的关系.

They attacked what was unknown, in order to make it known.

他们钻研未知的东西, 以便变不知为已知.

Assign a direction and a letter to each unknown current.

请对每个未知电流标以方向和字母记号.

Imaginations bodies forth the forms of things unknown.

想像力使未知事物的形像呈现于心中.

Ignorance of people brings fear, fear of the unknown.

人们的无知会带来恐惧，对未知事物的恐惧。

The sunbeams promised life and happiness and the glory of the unknown.

阳光孕育着生命和幸福,孕育着未知的光荣.

The best thing to do when entering unknown territory is smile.

踏入未知地带最好的对策就是微笑。

How did you expect us to proceed on such a perilous expedition, through unknown terrain.

你怎么能指望我们如此冒险地穿越未知的地域，继续这一探险？

People usually infer an unknown fact from a known fact.

人们通常从已知的事实中推断未知的事实.

There are many unknowns in science.

科学上还有许多未知之处.

From that moment she resolved to trace the unknown element.

从那日起,她决心找出这种未知的元素.

a hitherto unknown species of moth

迄今仍属未知种类的蛾