% --- 摘要样式 ---
\newcommand{\abstractfont}{\small\dwcn\raggedright}
\renewenvironment{abstract}{%
  \par\noindent
  \abstractfont
  \textbf{摘\hspace{1em}要：}%
  \ignorespaces
}{%
  \par
}
\newcommand{\keywordfont}{\small\dwcn}
