MWE:
```tex
\documentclass{ctexart}
\usepackage{amsmath}
\usepackage{zhlipsum}
\begin{document}
\zhl...
MWE:
```tex
\documentclass{ctexart}
\usepackage{amsmath}
\usepackage{zhlipsum}
\begin{document}
\zhlipsum[1]
\[
\int_{0}^{+\infty}\frac{1}{1+x^{2}}\,\mathrm{d}x
\]
\zhlipsum[2]
\begin{equation}
\int_{0}^{+\infty}\frac{1}{1+x^{2}}\,\mathrm{d}x
\end{equation}
\zhlipsum[3]
\end{document}
```
要缩小的垂直间距为下图蓝色区域

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