latex 单栏 并列双图

整体是双栏排版
需要在单栏插入两个图，并列显示

\begin{figure}[H]
  \centering
    \begin{minipage}[b]{\linewidth}
      \subfigure[]{
        \includegraphics[width=0.46\linewidth]{pictures/strategy (1).pdf}
      }
      \subfigure[]{
        \includegraphics[width=0.46\linewidth]{pictures/strategy (2).pdf}
      }
    \end{minipage}
    \begin{minipage}[b]{\linewidth}
      \subfigure[]{
        \includegraphics[width=0.46\linewidth]{pictures/strategy (3).pdf}
      }
      \subfigure[]{
        \includegraphics[width=0.46\linewidth]{pictures/strategy (4).pdf}
      }
    \end{minipage}
    \caption{xxxxxx.}
    \label{fig:xxxxx}
  \end{figure}\begin{figure}[H]