答案1
附带framed
包装:
\documentclass{article}
\usepackage{graphicx}
\usepackage{framed}
\begin{document}
\begin{figure}
\begin{framed}
\centering
\includegraphics[width=\linewidth]{example-image}
\caption[xxxxxxxxxxxxx]{xxxxxx}
\label{fig:base-case-constant-circulation}
\end{framed}
\end{figure}
\end{document}