XeTex 三种序列

Description Items:

\begin{description}
  \item[A] a is 
  \item[B] b is
\end{description}

 

Number Items:

\begin{enumerate}
    \item A
    \item B
\end{enumerate}

 

Items:

\begin{itemize}
  \item a
  \item b
\end{itemize}