\begin{center} \begin{tikzpicture} \node[rounded corners=3pt,minimum width=10.0em,minimum height=2.0em,draw,thick,fill=green!5,font=\scriptsize,drop shadow,inner sep=0.5em] (left) at (0,0) { \begin{tabular}{c} 名词\\ \rule{0pt}{12pt}cat,cats 、watch,watches\\ \rule{0pt}{12pt}baby,babies、wife,wives\\ \end{tabular} }; \node[rounded corners=3pt,minimum width=10.0em,minimum height=2.0em,draw,thick,fill=green!5,font=\scriptsize,drop shadow,inner sep=0.5em] (right) at ([xshift=8em]left.east) { \begin{tabular}{c} 动词\\ \rule{0pt}{12pt}do,did ,does,doing,done\\ \rule{0pt}{12pt}have,had,has,having\\ \end{tabular} }; \end{tikzpicture} \end{center}