生成黑点项目编号
\begin{itemize}
\item \textbf{Applies widely}\\
This system can be used for many types of airplanes, and it also
solves the interference during the procedure of the boarding
airplane,as described above we can get to the optimization
boarding time.We also know that all the service is automate.
\item \textbf{Improve the quality of the airport service}\\
Balancing the cost of the cost and the benefit, it will bring in
more convenient for airport and passengers.It also saves many
human resources for the airline. \item \textbf{}
\end{itemize}
自定义项目编号
\begin{enumerate}[\bf step 1]
\item good morning...
\item good morning....
\end{enumerate}