`$
text{学习}begin{cases}

\text{音乐}\smash[t]{\begin{cases} %\smash[t\b]{} 参数调节 括号头部的内容高度
        \text{古典音乐} \smash[t]{\begin{cases}
                \text{独唱}\\ \text{合唱}
        \end{cases}}\\[ 3ex ] 
        \text{现代音乐}
\end{cases}}\\[15ex]  % [ 10ex ]灵活调整上下的距离，杠杠的，同理可以调其它级
\text{美术} \smash[b]{\begin{cases}
        \text{素描} \\
        \text{油画}
\end{cases}}

end{cases}
$
`

https://www.latexstudio.net/index.php/index/details/index/mid/792.html

documentclass[twoside]{article}
%usepackage{showframe}
usepackage{fancyhdr}%导入fancyhdr包
usepackage{ctex}%导入ctex包
pagenumbering{arabic}%设置页码格式，大写字母标页
pagestyle{fancy}
fancyhead{} % 初始化页眉
fancyfoot{} % 初始化页脚
fancyhead[OR]{ Chiral Perturbation Theoryhspace{15em}thepage}
fancyhead[EL]{thepageqquad qquaditshape A Pich}
renewcommand{headrulewidth}{0pt}%分隔线宽度4磅
% fancyhead[OL,ER]{thepage}
%--------------------正文--------------------%
begin{document}
section{xiaoyeyimier}
I can swallow a bottle of alcohol and I'll feel like a Godzilla
newpage

In the low-energy regime, all the information on the original QED dynamics is embodied in the values of the two low-energy couplings a and b. The values of these constants can be computed, by explicitly integrating out the electron 

end{document}

大佬 这两边上下没对齐，好像奇偶页 错开了一部分。请问是哪里出了问题