渲染html时忽略了Latex命令

Question

当.Rmd文件被编入html时，乳胶命令被完全忽略。逐项，引号，甚至文本格式化disappers，以及文本。当编译到.pdf \ chapter时，声明为未定义的控制序列，并且暂停执行。

---
output:
  html_document:
    fig_caption: yes
    keep_md: yes
    theme: cerulean
    toc: yes
  pdf_document:
    fig_caption: yes
    keep_tex: yes
    toc: yes
---
\chapter{{Efficient R Coding}}

\section{Benchmarking}

Donald Knuth\sidenote{See \url{http://en.wikipedia.org/wiki/Donald_Knuth}} made the following statement on optimization:
  \begin{quote}
\textit{"We should forget about small efficiencies, say about 97\% of the time: premature optimization is the root of all evil."}
\end{quote}
\noindent So before we rush headlong into optimising our R code, we will spend some time determining when it is worthwhile optimising. In this chapter, we will look at benchmarking. In computing, a benchmark is obtained by running a set of programs in order to assess their relative performance.

\section{Simple benchmarks}

To construct a benchmark we typically use the following steps
\begin{enumerate}
\item Construct a function (or set of functions) around the feature we want to
benchmark. This function usually has an argument that allows us to vary the
complexity of the object. For example, a parameter \texttt{n} that alters the data

这是......

忽略枚举环境。章节和章节标题也被忽略。如何使pandoc渲染大括号中的内容？