latex中多图并排-Mark

Latex中多图并排排放：（Mark） -- 来自 https://www.v2ex.com/t/235185 点击打开链接

代码如下：

\begin{figure}
    \centering
    \subfigure[First subfigure]{
        \includegraphics[width=0.45\textwidth]{avatar}
    }
    \subfigure[second subfigure]{
    \begin{minipage}[b]{0.45\textwidth}
        \includegraphics[width=0.45\textwidth]{meleiluo}\hspace{0.02in} 
        \includegraphics[width=0.45\textwidth]{meleiluo} \vspace{0.1in} \\   
        \includegraphics[width=0.45\textwidth]{meleiluo}\hspace{0.02in} 
        \includegraphics[width=0.45\textwidth]{meleiluo}
    \end{minipage}}
    \caption{Two subfigures.}
    \label{fig:subfig} %% label for entire figure
\end{figure}