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。

The gap between the now knowable and unknowable is vast.

现已知与未知之事间的距离极大。

In algebra, the sign X usually denotes an unknown quantity.

在代数里, 符号X常用来表示未知数。

You must eliminate an unknown quantity.

你必须消去个未知数。

There are many unknowns in science.

科学上还有许多未知之处。

In order to define this irrotationality condition mathematically, let us consider the equation of motion in terms of velocities.

为了从数学上确定性件，我们考虑以速度为未知函数的运动方程。

Panosteitis is a common disease of unknown cause that causes pain and a shifting leg lameness in medium and large breed dogs.

犬全骨炎是中大型犬种常见的种未知原因引起的病，该病造成犬只疼痛并逐渐引起跛行。

The play opens with three similar figures of “indeterminable”age, Flo, Vi, and Ru, sitting quietly on a narrow bench like seat surrounded by darkness.

” （这部戏剧开场就是三个穿着相似，年龄未知的女人FLO, VI, 和RU坐在长椅上面的灰暗场景。

On the basis of theories of plasma physics and optical spectroscopy a new method named Multilineal Spectroscopy Analytic Solution for diagnosing are plasma is proposed.

根据等离子体物理学和光谱学理论，建立了种新的电弧等离子体的测试方法─—光谱多线解析法，可对未知配比的混合电弧等离子体的成分、温度甚至压力的空间分布作同时测定。

The best traders don't try to hide from these unknown variables by pretending they don't exist, nor do they try to intellectualize or rationalize them away through market analysis.

最优秀的交易者不会通过假装不知道来隐藏这些未知的变数，他们也不会通过市场分析把这些变数合理化。

Rand Flem-Ath and Graham Hancock all write that an unknown advanced civilization existed on the Antarctica continent and was destroyed by cataclysmic shifting of the crust of the Earth.

Ath和格雷厄姆·汉考克所有记载了在南极洲大陆上存在的并且被地球外壳大改变毁灭了的个未知先进文明.

The Wa FM supporters are a mixed group more akin to community groups (just like the residents opposing a highway in Sri Petaling), unestablished and of unknown potentials and capability.

FM”的支持者是类似社群群体（就如反对在大城堡高速公路的居民）、未经建制，其潜能与能力也是未知的。

We already possess, in the artesian well, the means of converting unfertile wastes into rich corn fields;and what unknown forces may not yet be hidden in the interior of the earth?

我们已经能够靠了自流井把不毛之地变成膏壤，地质也许还有什么未知力量在潜伏中有待发现，谁又能断言呢？