Writing order: write the outline first, then fill in the text
outline
Annotate and set the document class:
注释符号：% This is an annotation.
设置文档类（文章）：\documentclass{article}
设置文档类（美赛模板）：\documentclass{mcmthesis}The part before /begin{document} is called preamble (introduction area), which is usually used to set the nature of the document or customize some commands.
设置标题：\title{The Comprehensive Evacuation Planing Model in Case of Emergency}
设置作者：\author{ }
设置日期为今天：\date{\today}
声明参考文献格式：\bibliographystyle{plain}Declare the document environment: This is the text part of the thesis, and it is also the part of the direct output.
\begin{document}
\maketitle % 输出标题
\tableofcontents % 输出目录
\bibliographystytle{math} % 提示tex从math文献数据库中获取文献信息，打印参考文献列表
\section
\subsection
\end{document}Fill in the text
Space: It only serves to separate words and symbols, and using many spaces does not increase the spacing between words;
Empty lines: Empty lines act as paragraphs. A single newline only acts on the source code, making it more readable. Displaying article sections requires creating a blank line. Using a lot of blank lines does not increase the line spacing; in addition, LaTeX will automatically segment before the paragraph, no need to manually enter the space.