重现环境下方的垂直边距

Question

简而言之，我想重现定义下方的垂直边距和注释下方的双线，如下图所示：

我已经浏览过帖子了，但没有任何解决方案。本例中邮政是不够的。

\documentclass{article}
\usepackage{amsthm}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{lipsum}% just to generate text for the example

\newtheorem{theo}{Theorem}
\surroundwithmdframed[outerlinewidth=0.4pt,
  innerlinewidth=0.4pt,
  middlelinewidth=1pt,
  middlelinecolor=white,
  bottomline=false,topline=false,rightline=false]{theo}

\begin{document}

\begin{theo}
\lipsum[4]
\end{theo}

\end{document}

问题： 如何拥有定理下方的双杠如图所示双波浪线？

Answer 1

我已使用ntheorem缩进（见这个答案) 并tcolorbox添加装饰。

\documentclass{article}
\usepackage{lipsum}% just to generate text for the example
\usepackage{ntheorem}

\theoremstyle{plain}
\theoremindent40pt 
\theoremheaderfont{\normalfont\bfseries\hspace{-\theoremindent}}
\newtheorem{theo}{Theorem}[section]
\newtheorem{defin}{Definition}[section]

\usepackage[most]{tcolorbox}
\usetikzlibrary{decorations.pathmorphing}
\tcbuselibrary{skins}
\tcolorboxenvironment{theo}{
    blanker,
    breakable,
    before skip=\topsep,
    after skip=\topsep,
    borderline west={1pt}{20pt}{double, shorten <=12pt}
    }
\tcolorboxenvironment{defin}{
    blanker,
    breakable,
    before skip=\topsep,
    after skip=\topsep,
    borderline west={1pt}{20pt}{decoration={zigzag,amplitude=2pt,pre=moveto,pre length=12pt},decorate}
    }

\begin{document}
\section{My section}
\lipsum[4]
\begin{theo}
\lipsum[4]
\end{theo}
\lipsum[4]
\begin{defin}
\lipsum[4]
\end{defin}
\lipsum[4]
\end{document}