Beamer：为什么使用/不使用 threeparttable 时标题周围的间距不同？

Question

是什么原因导致 Beamer 中带字幕和不带字幕的字幕间距不一致threeparttable？这是什么原因造成的？可以修复吗？

我最近发过关于文章类中同一问题的问题，但有建议的解决方法似乎无法与 Beamer 配合使用。

\documentclass{beamer}
\usepackage{threeparttable,tabularx}
\begin{document}
  \begin{frame}{Only \texttt{table}}
    \begin{table}
      \caption{A table caption}
      \begin{tabularx}{\linewidth}{XXXX}
        A1 & B1 & C1 & D1 \\
        A2 & B2 & C2 & D2 \\
        A3 & B3 & C3 & D3 \\
      \end{tabularx}
    \end{table}
  \end{frame}

  \begin{frame}{Both \texttt{table} and \texttt{threeparttable}}
    \begin{table}
      \begin{threeparttable}
        \caption{A table caption}
        \begin{tabularx}{\linewidth}{XXXX}
          A1 & B1 & C1 & D1 \\
          A2 & B2 & C2 & D2 \\
          A3 & B3 & C3 & D3 \\
        \end{tabularx}
      \end{threeparttable}
    \end{table}
  \end{frame}
\end{document}

Answer 1

解决方法：将标题放在后面\begin{table}。此方法也适用于文章类。请参阅 https://tex.stackexchange.com/a/603136/161015

\documentclass{beamer}
\usepackage{threeparttable} 
\usepackage{tabularx}

\begin{document}
    \begin{frame}{Only \texttt{table}}
        \begin{table}
            \caption{A table caption}
            \begin{tabularx}{\linewidth}{XXXX}
                A1 & B1 & C1 & D1 \\
                A2 & B2 & C2 & D2 \\
                A3 & B3 & C3 & D3 \\
            \end{tabularx}
        \end{table}
    \end{frame}
    
    \begin{frame}{Both \texttt{table} and \texttt{threeparttable}}
        \begin{table}
            \caption{A table caption} % put the caption here
            \begin{threeparttable}          
                \begin{tabularx}{\textwidth}{XXXX}
                    A1 & B1 & C1 & D1 \\
                    A2 & B2 & C2 & D2 \\
                    A3 & B3 & C3 & D3 \\
                \end{tabularx}          
            \end{threeparttable}
        \end{table}
    \end{frame}
\end{document}