We opened an encyclopedia, asked our parents a question or two and, voila, we understand the concept of the unknown variable.

我们查了百科全书，问家长一两个问题，然后，我们就懂了代数中未知变量的概念。

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Conclusions: The multiple regression analysis may predict unknown variable from known variables in morphological application.

结论：在形态学上进行多元线性回归分析，可以通过某些已知变量来预测某个未知变量。

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By using the Fourier transform, the problem can be solved with a pair of dual integral equations in which the unknown variable is the jump of displacements across the crack surfaces.

首先利用付里叶变换，使问题的求解转换成对一对变量为裂纹面上位移差的对偶积分方程的求解。

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So, what we have found out so far, I'm purposely going from x to y because I want you to know that the unknown variable can be called an x or can be called a y.

到目前为止,我们有这些结论,我特地把x换成y,因为我想让你们明白,未知变量既可以写成x,也可以写成y

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