

%%% outline
%-------------------------------------------------------------------------

    
    \begin{tikzpicture}
    {\small
    \node [anchor=west,inner sep=2pt] (s1) at (0,0) {在};
    \node [anchor=west,inner sep=2pt] (s2) at ([xshift=1em]s1.east) {桌子};
    \node [anchor=west,inner sep=2pt] (s3) at ([xshift=1em]s2.east) {上};
    \node [anchor=north,inner sep=2pt] (t1) at ([yshift=-1.7em]s1.center) {on};
    \node [anchor=north,inner sep=2pt] (t2) at ([yshift=-1.5em]s2.center) {the};
    \node [anchor=north,inner sep=2pt] (t3) at ([yshift=-1.5em]s3.center) {table};
    \node [anchor=east,inner sep=2pt] (t0) at ([xshift=-1.5em]t1.west) {$t_0$};
    \draw [-] (s1.south) -- (t0.north);
    \draw [-] (s2.south) -- (t3.north);
    \draw [-] (s3.south) .. controls +(south:1em) and +(north:1em) .. (t1.north);
    }
    \end{tikzpicture}

%---------------------------------------------------------------------



