%%% outline
%-------------------------------------------------------------------------
\begin{tikzpicture}
%第一段----------------------------------------------
%原文-------------
\node [pos=0.4,left,xshift=-36em,yshift=7em,font=\small] (original0) {\quad 源语（中文）输入：};
\node [pos=0.4,left,xshift=-22em,yshift=7em,font=\small] (original1) {
\begin{tabular}[t]{l}
\parbox{14em}{“我”、“很”、“好”、“<eos>” }
\end{tabular}
};
%译文1--------------mt1
\node[font=\small] (mt1) at ([xshift=0em,yshift=-1em]original0.south) {目标语（英文）输出：};
\node[font=\small] (ts1) at ([xshift=0em,yshift=-1em]original1.south)  {
\begin{tabular}[t]{l}
\parbox{14em}{“I”、“am”、“fine”、“<eos>”}
\end{tabular}
};

\begin{pgfonlayer}{background}
{
\node[rectangle,draw=ublue, inner sep=0mm] [fit =(original0)(mt1)(ts1)(ts1)(original1)(original1)] {};
}
\end{pgfonlayer}


\end{tikzpicture}