\input chitexl

\documentclass[12pt]{letter}
\usepackage{cletter}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\makeatletter
\input chcolor
\ming

\begin{document}
\def\today{84 年 9 月 12 日}
\blue
\chmagnification 1320
\address{國立中央大學數學系\\
         science\\
         中壢, TAIWAN 32054\\
         ROC}

\signature{陳弘毅\\數學系教授}


\begin{letter}{單維章教授 \\
               國立中央大學數學系\\
               中壢, TAIWAN 32054\\
               ROC}

\opening{單教授:}

您好 !
I,m afraid that the armadillo problem
is still with us. I did everything.
\closing{時祺}
\ps
P.S. 中文信


\cc {黃華民}



\end{letter}

\end{document}