代码如下：
\documenclass[preprint,prd,amsmath,amssymb,amsthm,nofootinbib]{revtex4}
\usepackage {graphicx}
\usepackage {subfigure}
\begin{figure}[！htbp]
\centering
\includegraphics[width=0.4\textwidth]{figure.pdf}
\caption{\label{figure}} this is a figure.}
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