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				% 13-4-2.tex 用 pdfLaTeX 处理
				
				\documentclass[table]{beamer}
				
				\mode
				{
				  \usetheme{default}
				  % 可供选择的主题参见 beameruserguide.pdf, 第 134 页起
				  % 无导航条的主题: Bergen, Boadilla, Madrid, Pittsburgh, Rochester;
				  % 有树形导航条的主题: Antibes, JuanLesPins, Montpellier;
				  % 有目录竖条的主题: Berkeley, PaloAlto, Goettingen, Marburg, Hannover;
				  % 有圆点导航条的主题: Berlin, Dresden, Darmstadt, Frankfurt, Singapore, Szeged;
				  % 有节与小节导航条的主题: Copenhagen, Luebeck, Malmos, Warsaw
				
				  \setbeamercovered{transparent}
				  % 如果取消上一行的注解 %, 就会使得被覆盖部分变得透明(依稀可见)
				}
				
				\usepackage{times}
				\usepackage{pifont}
				
				\begin{document}
				\begin{frame}
				\begin{itemize}
				\item First point.
				\item Second point.
				\item Third point.
				\end{itemize}
				\end{frame}
				
				\begin{frame}
				\begin{itemize}[]
				\item First point.
				\item Second point.
				\item Third point.
				\end{itemize}
				\end{frame}
				
				\begin{frame}
				\begin{align}
				  A &= B \\
				    \uncover{&= C \\}
				    \uncover{&= D}
				\end{align}
				\end{frame}
				
				\begin{frame}
				\begin{align}
				  A &= B \\
				    \uncover{&= C \\}
				    \uncover{&= D \\}
				    \notag
				  \end{align}
				\vspace{-1.5em}
				\end{frame}
				
				\begin{frame}
				\rowcolors[]{1}{blue!20}{blue!10}
				\begin{tabular}{l!{\vrule}cccc}
				  Class & A & B & C & D \\\hline
				  X     & 1 & 2 & 3 & 4 \\\pause
				  Y     & 3 & 4 & 5 & 6 \\\pause
				  Z     & 5 & 6 & 7 & 8
				\end{tabular}
				\end{frame}
				
				\begin{frame}
				\rowcolors[]{1}{blue!20}{blue!10}
				\begin{tabular}{l!{\vrule}c				  Class & A & B & C & D \\
				  X     & 1 & 2 & 3 & 4 \\
				  Y     & 3 & 4 & 5 & 6 \\
				  Z     & 5 & 6 & 7 & 8
				\end{tabular}
				\end{frame}
				
				\newenvironment{ballotenv}
				{\only{%
				  \setbeamertemplate{itemize item}{\ding{56}}%
				  \setbeamertemplate{itemize subitem}{\small\ding{56}}%
				  \setbeamertemplate{itemize subsubitem}{\footnotesize\ding{56}}}}
				{}
				
				\setbeamertemplate{itemize item}{\ding{52}}
				\setbeamertemplate{itemize subitem}{\small\ding{52}}
				\setbeamertemplate{itemize subsubitem}{\footnotesize\ding{52}}
				
				\begin{frame}
				\begin{itemize}
				\item First point.
				\item Second point.
				\item Third point.
				\end{itemize}
				\end{frame}
				
				\begin{frame}
				\begin{itemize}[]
				\item First point.
				\item Second point.
				\item Third point.
				\end{itemize}
				\end{frame}
				\end{document}