Beamer 中的页面链接

\documentclass[]{beamer}
\usetheme{Madrid}

\usenavigationsymbolstemplate{}

\title{Main Title}
\author{Jane Doe}
\institute{University A}
\date{\today}

\begin{document}

\begin{frame}
\titlepage % Print the title page as the first slide
\end{frame}

\begin{frame}
\frametitle{First Page}
\begin{exampleblock}{Example}
This is an example which will be used later.
\end{exampleblock}
\end{frame}

\begin{frame}
\frametitle{Second Page}
\label{important}
\begin{itemize}
\item Item 1
\item Item 2
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Third Page}
\begin{itemize}
\item In this slide, we are going to use the sample example on slide~\ref{important}.
\end{itemize}
\end{frame}

\end{document}