答案1
有很多方法可以实现这一点。这是一个使用subfig
包的示例:
\documentclass{article}
\usepackage{subfig}
\usepackage{mwe}
\begin{document}
\begin{figure}
\centering
\subfloat[title pic 1]{\includegraphics[width=0.4\textwidth]{example-image}}\hspace{0.5cm}
\subfloat[title pic 2]{\includegraphics[width=0.4\textwidth]{example-image}}\\
\caption*{A-picture (a) and (b)}
\subfloat[title pic 3]{\includegraphics[width=0.4\textwidth]{example-image}}\hspace{0.5cm}\subfloat[title pic 4]{\includegraphics[width=0.4\textwidth]{example-image}}\\
\caption*{B-picture (a) and (b)}
\caption{Figure title of all sub-pictures}
\end{figure}
\end{document}