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Beamer Overlay 用于“商品标签”的“描述”

tag-icon • tag-icon beamer overlays description pause
Beamer Overlay 用于“商品标签”的“描述” 
   \documentclass{beamer}
\usetheme{Warsaw}
\usecolortheme{crane}
\setbeamercolor{frametitle}{bg=gray!10!white}
\usefonttheme{professionalfonts}
%\setbeamertemplate{headline}{}
%remove navigation 
\beamertemplatenavigationsymbolsempty
\usepackage{booktabs, textcomp}  % Tables
\usepackage{tabularx,caption}
\usepackage{tikz}      % Diagrams
\usetikzlibrary{calc, shapes, backgrounds}
\usepackage{amsmath, amssymb}
\usepackage{url}       % `\url`s
\usepackage{listings}  % Code listings
\beamertemplatenavigationsymbolsempty
%----------------------------------------------------------------------
\usepackage{tikz}
\usetikzlibrary{trees}
\usepackage{graphics}
\title{Chronic diarrhea: a case based Approach} 
\author{Dr }
\date {\today}
\institute{My Hospital }
\usepackage{tikz}
\usetikzlibrary{trees}
\begin{document}
\begin{frame}
\maketitle
\end{frame}
%----------------------------------------------------------------------------------------------
\begin{frame}{Terminologies/ definitions}
\begin{description}
    \item [Diarrhea] 
    \item [Acute diarrhea]
    \item [persistent diarrhea]
    \item [Chronic diarrhea]
\end{description}
\end{frame}
%---
\begin{frame} {Terminologies/ definitions}
\begin{description}
    \item [Diarrhea] Increase in the fluidity / frequency of stool 
    \item [Acute diarrhea] $\leq$ 2 weeks 
    \item [Persistent diarrhea] 2 to 4 weeks 
    \item [Chronic diarrhea] $\geq $4 weeks 
\end{description}
\end{frame}
\end{document}

嗨，这是我正在准备的 Beamer 演示文稿的 mwe。我希望描述的项目标签首先出现，然后在下一张幻灯片中出现描述。我通过复制幻灯片粗略地实现了这一点。但一定有更好的方法。请帮忙

答案1

就像@samcarter 所说，您必须将您的定义作为only命令的参数。

\documentclass{beamer}
\usetheme{Warsaw}
\title{Chronic diarrhea: a case based Approach} 
\author{Dr }
\date {\today}
\institute{My Hospital }
\begin{document}
\begin{frame}
\maketitle
\end{frame}
%----------------------------------------------------------------------------------------------
\begin{frame} {Terminologies/ definitions}
\begin{description}[Persistent diarrhea]
%% Persistent diarrhea is the longest item. 
%% We add it as an option of the *description* environment 
%%    to have all the items aligned on the right.
    \item [Diarrhea] \only<2>{Increase in the fluidity / frequency of stool }
    \item [Acute diarrhea] \only<2>{$\leq$ 2 weeks }
    \item [Persistent diarrhea] \only<2>{2 to 4 weeks }
    \item [Chronic diarrhea] \only<2>{$\geq $4 weeks }
\end{description}
\end{frame}
\end{document}

您可以only在以下位置找到有关命令的文档维基百科。

顺便说一句，您原始帖子中给出的示例不是 MWE，因为这里很多套餐都是收费的并且毫无用处。

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