加颜色区分吧 ```tex \documentclass{article} \usepackage{tikz} \begin{document} \begin{tikzpicture} [inner sep=0.5mm, A/.style={circle,draw=black!20,fill=orange,thick}, B/.style={circle,draw=black!20,fill=green,thick}] \node[A] (8) at ( 0,1) {8}; \node[A] (7) at ( 0,0) {7}; \node[A] (6) at ( 1,0) {6}; \node[B] (3) at ( 1,1) {3}; \node[B] (4) at ( 2,1) {4}; \node[B] (1) at ( 1,2) {1}; \node[B] (2) at ( 2,2) {2}; \draw (8) -- (3); \draw (8) -- (7); \draw (7) -- (6); \draw (6) -- (3); \draw (3) -- (1); \draw (3) -- (4); \draw (1) -- (2); \draw (2) -- (4); \draw (1) -- (4); \draw[red] (2) -- (3); \end{tikzpicture} \end{document} ```