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答案1
根据@Marijn的建议,我在MWE中提出了解决方案:
\documentclass{article}
\usepackage{tikz}
\usepackage{accsupp}
\usetikzlibrary{mindmap}
\begin{document}
\begin{tikzpicture}
\node (energy1) at (30:10cm){Text};
\node (energy2) at (90:10cm) {Text};
\draw [circle connection bar]
(energy1) edge (energy2)
;
\draw (energy1)--node[orange, sloped,above=0.5cm,align=center,text width=8cm]{\textsc{%
\BeginAccSupp{method=escape,ActualText=USA}%
usa%
\EndAccSupp{}}%
}(energy2);
\end{tikzpicture}
\end{document}