%%%------------------------------------------------------------------------------------------------------------
%%%  树到串规则
\begin{center}
\begin{tikzpicture}

\begin{scope}[scale=1]
\Tree[.\node(sn1){VP};
        [.\node(sn2){VV}; \node(scw1){提高}; ]
        [.\node(sn3){NN}; ]
     ]

\path [draw, ->, thick] ([xshift=1em]sn3.east) -- ([xshift=2.5em]sn3.east);

\node [anchor=west] (tw1) at ([xshift=3.5em]sn3.east) {increases};
\node [anchor=west,fill=red!20] (tw2) at ([xshift=0.3em]tw1.east) {NN};

\draw[dotted,thick,<->] ([yshift=-0.1em]sn3.south)..controls +(south:1.2) and +(south: 1.2)..([yshift=-0.1em]tw2.south);

\begin{pgfonlayer}{background}
\node [rectangle,inner sep=0em,fill=red!20] [fit = (sn3)] (nn1) {};
\end{pgfonlayer}

\end{scope}

\end{tikzpicture}
\end{center}