Paracol 保持列与分页符同步

Question

我有一个两列布局定义如下：

\usepackage{paracol}
\newcommand{\btwocol}{\begin{paracol}{2}}
\newcommand{\etwocol}{\end{paracol}}


\btwocol
Connect
Make sure that you can answer to the following questions:

\begin{itemize}
\tightlist
\item
  How do rockets work?
\item
  What would it take to ensure that rockets are safe?
\item
  What types of rocket propulsion systems do you know?
\end{itemize}

Later you will learn more prewriting strategies that will narrow the focus of the topic.

\vspace{5mm} \switchcolumn  \ensurevspace{2\baselineskip}

\begin{figure}
\centering
\includegraphics{https://upload.wikimedia.org/wikipedia/commons/thumb/2/27/Soyuz_rocket_ASTP.jpg/1200px-Soyuz_rocket_ASTP.jpg}
\caption{}
\end{figure}

\vspace{5mm}

\etwocol

我正在使用多个\btwocol \etwocol块在列布局中创建部分，我遇到的问题如下：

如果我在靠近页面末尾的地方开始一个新的部分，并且左列内容非常小并且可以适合该页面，但第二列图像不适合，则第一列将显示在页面上，n而第二列图像将被推送到页面n+1。

如果第二列的内容放不下，有没有办法强制 paracol 对某一部分的两列进行垂直对齐？

以下是该问题的一个例子以及我想要实现的目标

Answer 1

我从未使用过 pandoc 或 imageurl（你确实需要在 MWE 中放入类似的东西），我不知道这是否适合你。但既然我努力创建了以下内容，我想分享一下。

\documentclass{article}
\usepackage{graphicx}
\usepackage{showframe}

\newsavebox{\rightcolumn}% must be done first, #1 not passed

\makeatletter% for \@captype
\newenvironment{twocol}[1]% #1 = image and caption
{\setlength{\columnwidth}{\dimexpr 0.5\textwidth-0.5\columnsep}%
  \savebox{\rightcolumn}{\begin{minipage}{\columnwidth}
    \def\@captype{figure}#1\end{minipage}}
  \par\noindent\minipage[t]{\columnwidth}\strut}
{\endminipage\hfill
  \raisebox{\dimexpr\topskip-\ht\rightcolumn}{\usebox{\rightcolumn}}\par}
\makeatother

\begin{document}
\begin{twocol}{\includegraphics[width=\columnwidth]{example-image}\caption{test}}
Connect
Make sure that you can answer to the following questions:

\begin{itemize}
%\tightlist% from enumiten?
\item
  How do rockets work?
\item
  What would it take to ensure that rockets are safe?
\item
  What types of rocket propulsion systems do you know?
\end{itemize}

Later you will learn more prewriting strategies that will narrow the focus of the topic.
\end{twocol}
\end{document}