Beamer：列环境

Question

我找不到为什么列环境不起作用。这是 MWE：

\documentclass{beamer}
\begin{document}
\begin{frame}
\begin{columns}
\column 
\begin{itemize}
    \item Conduction
    \item Convection
    \begin{itemize}
        \item<2-> Forced
        \item<2-> Natural
    \end{itemize}
    \item Radiation
    \end{itemize}
\column 
\begin{itemize}
    \item Rayleigh No.
    \item Grashof No.
\end{itemize}
\end{columns}
\end{frame}
\end{document}

Answer 1

使用\column{0.5\textwidth}。

代码

\documentclass{beamer}
    \begin{document}
    \begin{frame}
    \begin{columns}
    \column{0.5\textwidth} 
    \begin{itemize}
        \item Conduction
        \item Convection
        \begin{itemize}
            \item<2-> Forced
            \item<2-> Natural
        \end{itemize}
        \item Radiation
    \end{itemize}
    \column{0.5\textwidth} 
    \begin{itemize}
        \item Rayleigh No.
        \item Grashof No.
        \end{itemize}
    \end{columns}
    \end{frame}
    \end{document}