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				% 9-4-1.tex
				\documentclass{article}
				\usepackage{CJK}
				\newcommand*{\HEI}{\CJKfamily{hei}}
				\newcommand*{\KAI}{\CJKfamily{kai}}
				\newtheorem{theorem}{Theorem}[section]
				\begin{CJK}{GBK}{song}
				\newtheorem{dingli}{\HEI定理}[section]
				\end{CJK}
				\begin{document}
				\begin{theorem}[Fermat] There do not exist integers $n>2$, $x$, $y$, and $z$
				such that $x^n+y^n=z^n$.
				\end{theorem}
				
				\begin{CJK*}{GBK}{song}
				\CJKtilde
				\begin{dingli}[{\HEI费马}]
				{\upshape\KAI不存在使得~$x^n+y^n=z^n$~的整数~$n>2$、$x$、$y$~以及~$z$.}
				\end{dingli}
				\end{CJK*}
				\end{document}