我正在使用静态框架来flowfram设计海报，并且遇到了一些垂直间距问题（尤其是titlesec，它似乎忽略了压缩我的前节间距，但这似乎是另一个问题）。 尝试缩小问题范围时，我注意到\parskip如果我在框架外定义它，似乎没有任何效果：
%!TeX encoding = UTF-8 Unicode
\documentclass[12pt]{article}
\usepackage[]{geometry}
\usepackage{multicol}
%%%%%%%%%%%%%%%% the frames %%%%%%%%%%%%%%%%%
\usepackage[draft]{flowfram}
\newstaticframe[1]{150mm}{200mm}
{10mm}{10mm}[introduction]
\setallstaticframes{valign=t}
% add dummy flow frames to please the package
\newflowframe[1]{\textwidth}{0pt}{0pt}{0pt}
\newflowframe[>1]{\textwidth}{\textheight}{0pt}{0pt}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setlength{\parskip}{2em} % this has no effect
\setlength{\parindent}{20pt} % neither does this
\begin{document}
\begin{staticcontents*}{introduction}
\setcounter{unbalance}{10}
\begin{multicols}{2}
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
commodo consequat.
$$
\alpha = \beta
$$
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum
dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua.
\columnbreak
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
commodo consequat. Lorem ipsum dolor sit amet, consectetur adipiscing
elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum
dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
\end{multicols}
\end{staticcontents*} % end-introduction
\end{document}
我找不到任何内容来解释这种multicol行为flowfram。