488. LaTeX技巧170：如何在双栏模式里显示单栏图

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From
http://www-h.eng.cam.ac.uk/help/tpl/textprocessing/multicol_hint.html

Figures and Tables in multicol
If you use \begin{figure} ... \end{figure} in a multicols environment, the figure won't appear. If instead you use \begin{figure*} ... \end{figure*} the figure will stretch right across the page, probably at the top of the page

It's possible to have single-column figures and tables with captions, but you might have to fiddle with the placement because they won't 'float'. Put the following before \begin{document}

\makeatletter
\newenvironment{tablehere}
{\def\@captype{table}}
{}

\newenvironment{figurehere}
{\def\@captype{figure}}
{}
\makeatother

then use figurehere and tablehere where you'd normally use figure[h....] and table[h...]