思源的公式效果：
\begin{pmatrix}
\cfrac{\partial f_{1}^{1}}{\partial x_{k}^{1}}& \cfrac{\partial f_{1}^{1}}{\partial x_{k}^{2}}& \cfrac{\partial f_{1}^{1}}{\partial x_{k}^{3}}& \cfrac{\partial f_{1}^{1}}{\partial y_{k}^{1}}& \cdots& \cfrac{\partial f_{1}^{1}}{\partial \psi _{k}^{3}}\\
\cfrac{\partial f_{1}^{2}}{\partial x_{k}^{1}}& \cfrac{\partial f_{1}^{2}}{\partial x_{k}^{2}}& \cfrac{\partial f_{1}^{2}}{\partial x_{k}^{3}}& \cfrac{\partial f_{1}^{2}}{\partial y_{k}^{1}}& \cdots& \cfrac{\partial f_{1}^{2}}{\partial \psi _{k}^{3}}\\
\cfrac{\partial f_{1}^{3}}{\partial x_{k}^{1}}& \cfrac{\partial f_{1}^{3}}{\partial x_{k}^{2}}& \cfrac{\partial f_{1}^{3}}{\partial x_{k}^{3}}& \cfrac{\partial f_{1}^{3}}{\partial y_{k}^{1}}& \cdots& \cfrac{\partial f_{1}^{3}}{\partial \psi _{k}^{3}}\\
\cfrac{\partial f_{2}^{1}}{\partial x_{k}^{1}}& \cfrac{\partial f_{2}^{1}}{\partial x_{k}^{2}}& \cfrac{\partial f_{2}^{1}}{\partial x_{k}^{3}}& \cfrac{\partial f_{2}^{1}}{\partial y_{k}^{1}}& \cdots& \cfrac{\partial f_{2}^{1}}{\partial \psi _{k}^{3}}\\
\vdots& \vdots& \vdots& \vdots& \ddots& \vdots\\
\cfrac{\partial f_{3}^{4}}{\partial x_{k}^{1}}& \cfrac{\partial f_{3}^{4}}{\partial x_{k}^{2}}& \cfrac{\partial f_{3}^{4}}{\partial x_{k}^{3}}& \cfrac{\partial f_{3}^{4}}{\partial y_{k}^{1}}& \cdots& \cfrac{\partial f_{3}^{4}}{\partial \psi _{k}^{3}}\\
\end{pmatrix}_{12\times 18}
在线 LaTeX 公式编辑器-编辑器生成的公式图片：
希望把矩阵的间距调大一些。（或者稍微缩小一点字体？）
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