如何使用 rmarkdown 和 pandoc 在表中编写多级（项目符号）列表

我希望使用以下方法在 PDF 文档中创建表格rmarkdown, knitr and pander。我能够创建一个简单的项目符号列表 https://stackoverflow.com/questions/31011265/how-to-write-bullet-lists-in-a-table-using-rmarkdown-and-pandoc但现在需要该列表中的另一个级别。在下表中，我要求“好评如潮”项目符号成为“提供研讨会...”项目符号的子项目符号。

我遇到的问题与下面的代码行有关mytable数据帧中Description柱子。尽管我尝试使用以下命令创建子项目符号所需的 4 个空格\x20[1]，这些空格不会出现 - 因此没有子项目符号（尽管没有显示错误）。我也尝试了最明显的方法，简单地在代码中添加 4 个空格，但没有成功。还尝试设置我的R包括的选项strip.white = FALSE，但这也被证明没有帮助（见下文）。

---
title: "xxx"
author: "xxx"
output:
  pdf_document:
    fig_height: 4
    fig_width: 10
    highlight: tango
  word_document: default
geometry: margin=3cm
---

```{r global_options, include=FALSE, echo=FALSE}
require(knitr)
opts_chunk$set(fig.width=8, fig.height=4, fig.path='figs/', dpi=500,
               echo=FALSE, warning=FALSE, message=FALSE, results='hide', strip.white = FALSE)
```

```{r pandoc_options, include=FALSE, echo=FALSE}
require(pander)
panderOptions('digits', 3)
panderOptions('round', 3)
panderOptions('keep.trailing.zeros', TRUE)
panderOptions('keep.line.breaks', TRUE)
```

```{r concepts, echo=FALSE}
mytable = data.frame(
    Concept     = c("Decoded", "XXX"),
    Description = c("* Founded in 2011\ \n* Offers workshops to take people from zero skills and knowledge in programming through to coding a multi-platform app using HTML, CSS and Javascript in a single day\ \n\x20\x20\x20\x20+ Rave reviews", "XXX"),
    Website     = c("http://decoded.com/uk/","XXX"))
```

``` {r concepts_descriptions, results = 'asis'}
pander::pander(mytable, keep.line.breaks = TRUE, style = 'grid', justify = 'left')
```

参考

[1] 我得到了\x20暗示来自here https://r.789695.n4.nabble.com/blank-space-escape-sequence-in-R-td3473104.html，尝试后\\s, \s, \ \s, \\\s等无济于事（建议here https://stackoverflow.com/questions/5992082/how-to-remove-all-whitespace-from-a-string).

您可以将项目嵌套在项目符号内：

```{r concepts, echo=FALSE}
mytable = data.frame(
    Concept     = c("Decoded", "XXX"),
    Description = c("* Founded in 2011\ \n
    * Offers workshops to take people from zero skills and knowledge in programming through to coding a multi-platform app using HTML, CSS and Javascript in a single day\ \n
    \\begin{itemize}
      \\item Rave reviews \n
      \\item e.t.c
    \\end{itemize}", "XXX"),
    Website     = c("http://decoded.com/uk/","XXX"))
```