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汉语拼音：wèi zhī shù

1.代数式或方程中，数值需要经过运算才能确定的数。如3x+6=27中，x是未知数。

2.比喻还不知道的事情：能否成功，还是个～。

1. 数学名词。指代数式或方程中数值需要经过运算才能确定的数。亦喻指尚未了解的事物。

   魏巍 《东方》第四部第十七章：“当这个遥远的目标还是未知数的时候，我们自己的航船已经在礁石上被撞碎了。”如：此事能否成功还是个未知数呢。

• The length of the war is one of the biggest unknowns.

  战争要持续多久是最大的未知数之一。

• He is an unknown quantity for his rivals.

  对于对手们而言，他是个未知数。

• To her the outside world was a totally unknown quantity.

  对她来说,外部世界完全是个未知数.

• 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.

• The scientist was faced with many unknown factors.

  那个科学家面临许多未知数.

• It's still uncertain whether the College Spring Sports will be held this year.

  学院今年的春运会是否开还是个未知数.

• It was like a single equation with two unknowns.

  这挺像两个未知数组成了个简单方程.

• Whether the project will be a commercial success is still uncertain.

  这个项目是否赚钱还是个未知数。

• The thrill of the unknown could not be recaptured.

  未知数引起的激动情绪是不可能再有了.

• The unknowns in the equations are the values of the dependent variables at the node.

  方程中的未知数是结点上因变量的值.

• The unknowns in the above equation are referred to the local numbering system.

  上述方程中,未知数是属于局部编号系统的.

• John is a possibility for the job, but he is still an unknown quantity.

  约翰可能获得这工作但(能否获得)现在还是个未知数.

• Whether the benefits are worth such costs remains written in the stars.

  花这么多钱到底值不值仍然是个未知数.

• There are still are lot of unknowns, but it is more clear.

  虽然仍存在许多未知数, 但情况已经更加明确了.

• But it is unclear when deal making might return to previous highs.

  不过,交易数量能否回到从前的高位还是个未知数.