\documentclass[]{jsbook}
\usepackage{psfrag,graphicx,color,defvar2,eclepsf,othermac}
\pagestyle{empty}
\begin{document}
\begin{center}
\bigskip %%%%%%%%%%%%
\begin{tabular}{c@{\hspace{3em}}c}
 \hline
 {\large\bf $B@~7A%7%9%F%`(B} & {\large\bf $BHs@~7A%7%9%F%`(B} \\
 \hline
 $\dot{x} = A x $      & $\dot{x} = f(x) $\\
%$B0BDj@-2r@O$OHf3SE*MF0W(B      & $BMM!9$J7ABV$N0BDj@-!$IT0BDj@-(B \\
$B0BDj@-2r@O$OHf3SE*MF0W(B  & $B0BDj@-2r@O$OI,$:$7$bMF0W$G$J$$(B\\
$B?6Iq$$$NM=B,$,2DG=(B      & $B?6Iq$$$NM=B,$O:$Fq$"$k$$$OIT2DG=(B \\
$BM}O@BN7O$,$[$\3NN)(B      & $B?7$?$KH/8+$5$l$k8=>]$N2r@O$HJ,N`$,2]Bj(B\\
$B2r$N2r@OE*I=8=$,2DG=(B    & $B?tCM7W;;$K$h$k;n9T:x8m$,M-NO<jCJ(B\\
 \hline
\end{tabular}
\end{center}
\end{document}
