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+% Chapter 1
+
+\chapter{常用环境}
+
+\section{公式}
+\index{g@公式}
+\zhlipsum*[42][name = aspirin]
+\begin{equation}\label{eq:matrix}
+  \bm{A} = \left[
+    \begin{matrix}
+      a_{11} & a_{12} & \cdots & a_{1n} \\
+      a_{21} & a_{22} & \cdots & a_{2n} \\
+      \vdots & \vdots & \ddots & \vdots \\
+      a_{m1} & a_{m2} & \cdots & a_{mn} \\
+    \end{matrix}
+  \right] = \left[
+    \begin{matrix}
+      \bm{a}_1 & \bm{a}_2 & \cdots & \bm{a}_n
+    \end{matrix}
+  \right]
+\end{equation}
+可以通过添加标签在正文中引用公式，如带有中文括号的引用\cref{eq:matrix}。
+
+\zhlipsum*[56][name = aspirin]
+\begin{equation}
+  \begin{split}
+    \iint_{A}E\rho(\bm{v}\cdot\bm{n})\mathrm{d}A + \frac{\partial}{\partial t}\iiint_{V}E\rho \mathrm{d}V &= \frac{\delta Q}{\mathrm{d}t} - \frac{\delta W}{\mathrm{d}t}
+    \\
+    \iint_{A}\left(U + \frac{v^{2}}{2} + gz + \frac{P}{\rho}\right)\rho(\bm{v}\cdot\bm{n})\mathrm{d}A + \frac{\partial}{\partial t}\iiint_{V}E\rho\mathrm{d}V &= \frac{\delta Q}{\mathrm{d}t} - \frac{\delta W_{s}}{\mathrm{d}t}
+  \end{split}
+\end{equation}
+
+\zhlipsum*[42][name = aspirin]
+\begin{subnumcases}{y =}
+  C_1e^{r_1x} + C_2e^{r_2x} & \quad $p^2 - 4q > 0$
+  \\
+  \left(C_1 + C_2\right)e^{r_1x} & \quad $p^2 - 4q = 0$
+  \\
+  e^{\alpha x}\left(C_1\cos\beta x + C_2\sin\beta x\right) & \quad $p^2 - 4q < 0$
+\end{subnumcases}
+
+\zhlipsum*[57][name = aspirin]
+\vfill{\small\doclicenseThis}
+
+\clearpage
+\section{插图}
+\index{c@插图}
+当我们需要排列一组子图共享标题的图片时，可以使用依赖于 \lstinline{caption} 宏包的 \lstinline{subcaption} 宏包的功能，效果见\cref{fig:example}。
+\begin{figure}[htbp]
+  \centering
+  \subcaptionbox{并排子图1}
+    {\includegraphics[width=0.4\textwidth]{example-image-4x3}}
+  \hspace{1.2em}
+  \subcaptionbox{并排子图2}
+    {\includegraphics[width=0.4\textwidth]{example-image-4x3}}
+  \bicaption[使用subcaption排版子图]{使用subcaption宏包的subcaptionbox命令排版子图}[Use subcaption to typeset subgraphs]{Use the subcaptionbox command of the subcaption package to typeset sub-pictures}\label{fig:example}
+\end{figure} 
+
+\section{表格}
+\index{b@表格}
+合并表格列使用 \lstinline{\multicolumn} 命令，合并行可以使用 \lstinline{makecell} 宏包的 \lstinline{\multirowcell} 命令。当插入的表格内容过长以至于一行放不下的情况可以使用 \lstinline{tabularx} 环境，文档类设置了\textsf{L、C和R}三个列对齐选项，一个例子如\cref{tab:example} 所示。
+\begin{table}[htbp]
+  \centering
+  \bicaption{使用tabularx创建内容过长表格}{Use tabularx to create a table with too long content}\label{tab:example}\small
+  \begin{tabularx}{0.87\textwidth}{@{}llL@{}}
+    \toprule
+    Aliquam & Integer & Pellentesque tincidunt purus
+    vel magna. \\
+    \midrule
+    viverra & \multirowcell{3}[0ex][l]{metus} & Nulla malesuada porttitor diam. Vestibulum lectus. Proin mauris. Proin eu nunc eu urna hendrerit faucibus. \\
+    semper & & Nullam elementum, urna vel imperdiet sodales, elit ipsum pharetra ligula, ac pretium ante justo a nulla. Curabitur tristique arcu eu metus. \\
+    \multicolumn{2}{c}{\multirowcell{3}{convallis}} & Nunc elementum fermentum wisi. Aenean placerat. Ut imperdiet, enim sed gravida sollicitudin, felis odio placerat quam, ac pulvinar elit purus eget enim. \\
+    \bottomrule
+  \end{tabularx}
+\end{table}
+
+\clearpage
+\section{列表}
+\index{l@列表}
+
+\subsection{排序列表}
+\index{l@列表!p@排序列表}
+\begin{enumerate}
+  \item \zhlipsum[41-42][name = aspirin]
+  \begin{enumerate}
+    \item \zhlipsum*[42][name = aspirin]
+  \end{enumerate}
+  \item \zhlipsum*[42][name = aspirin]
+\end{enumerate}
+
+\subsection{常规列表}
+\index{l@列表!c@常规列表}
+\begin{itemize}
+  \item \zhlipsum[41-42][name = aspirin]
+  \begin{itemize}
+    \item \zhlipsum*[42][name = aspirin]
+  \end{itemize}
+  \item \zhlipsum*[42][name = aspirin]
+\end{itemize}
+
+\subsection{主题列表}
+\index{l@列表!z@主题列表}
+\begin{description}
+  \item[主题一] \zhlipsum*[42][name = aspirin]
+  \item[主题二] \zhlipsum*[42][name = aspirin]
+\end{description}
+\ No newline at end of file