答案1
不妨这样开始:
\documentclass[tikz]{standalone}
\usetikzlibrary{shapes}
\begin{document}
\begin{tikzpicture}
\node[draw,circle,minimum size=7cm] (c1) at (0,0) {};
\node[draw,ellipse, minimum height=4cm,minimum width=2cm] (e1) at (0,1) {};
\node[draw,ellipse, minimum height=2cm,minimum width=4cm] (e2) at (1,1) {};
\node[text width=3cm] (l1) at (6,6) {Topological `reunion'?};
\node[text width=3cm] (l2) at (7,1) {AECH};
\node[text width=3cm] (l3) at (0.5,-3) {Matrix module};
\draw[->] (c1) -- (l1);
\draw[->] (e2) -- (l2);
\draw[->] (e1) -- (l3);
\end{tikzpicture}
\end{document}
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