如何删除投影机中不需要的空间？

Question

这是我的代码：

\documentclass{beamer}
\usetheme{Berkeley}

\begin{document}

\section{Formula}   
\subsection{Time-varying Coefficients}
    \begin{frame}{Time-varying Coefficients}
    \setbeamercovered{transparent}
    Used to get the degree of ERPT:\\
    $$ERPT = \alert<2>{\beta_0} + \alert<3>{\phi_0}\alert<4>{G(s_t;\gamma,c)}$$
    \begin{description}
        \uncover<2,5>{\item [$\beta_0$] pass-through elasticity}
        \uncover<3,5>{\item [$\phi_0$] pass-through coefficient}
        \uncover<4,5>{\item [$(s_t;\gamma,c)$] logistic transition function driving the nonlinear dynamic}
        \item[]
    \end{description}
    \end{frame}
    \end{document}

如果我删除了它，\item[]它\item [$(s_t;\gamma,c)$] logistic transition function driving the nonlinear dynamic就会左对齐到边框！

Answer 1

您不需要\uncover，您已经设置了transparent选项。请\item<...>改用：

\documentclass{beamer}
\usetheme{Berkeley}

\begin{document}

\section{Formula}   
\subsection{Time-varying Coefficients}
    \begin{frame}{Time-varying Coefficients}
        \setbeamercovered{transparent}
        Used to get the degree of ERPT:\\
        \[ERPT = \alert<2>{\beta_0} + \alert<3>{\phi_0}\alert<4>{G(s_t;\gamma,c)}\]
        \begin{description}
            \item<2,5>[$\beta_0$] pass-through elasticity
            \item<3,5> [$\phi_0$] pass-through coefficient
            \item<4-> [$(s_t;\gamma,c)$] logistic transition function driving the nonlinear dynamic
        \end{description}
    \end{frame}
\end{document}