![跨array对齐](https://wenda.latexstudio.net/data/attach/191020/Ll0qNbGT.png 跨array对齐)
```tex
$$
IM_x^t...
![跨array对齐](https://wenda.latexstudio.net/data/attach/191020/Ll0qNbGT.png "跨array对齐")
```tex
$$
IM_x^t\left\{\begin{array}{}
{CT_x^t } , {(t=1)} \\
{\left\{\begin{array}{l}
{CT_x^t-CT_x^t *(C T_x^t-IM_x^{t-1})} &, {\text { if } IM_x^{t-1} \neq 0} \\
{CT_x^t * 0.5} &, {\text { if } IM_x^{t-1}=0}
\end{array}\right.}
\end{array}\right.
$$
```
如图,如何实现array内和嵌套array内的公式按照逗号对齐呢?
要达到的效果是类似这样的:
![对齐效果](https://wenda.latexstudio.net/data/attach/191020/qddj3DpI.png)
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