LATEX双栏模板插入通栏图片：

\begin{figure*}[htbp]
  % Requires \usepackage{graphicx}
  \centering
  \includegraphics[width=0.8\linewidth]{./Pic/2}% 1\linewidth
  \caption{The overview of delivery system.}\label{fig.2}
\end{figure*}