rmarkdown:粗体里面 \tabular{}

rmarkdown: bold inside \tabular{}

我有

---
title: ""
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = F)
```

\begin{tabular}[t]{@{}ll}
***Why***  & one\  
*does* & two\
**this happen** & three \ 
  \end{tabular}

但是为什么这种情况会以普通字体出现而不是italics/bold。

我该如何更改?

这完成了工作

---
title: ""
output: pdf_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = F)
```

\begin{tabular}[t]{@{}ll}
  \textbf{Why}  & one\  
  \textbf{does} & two\
  \textbf{This happen} & three \ 
    \end{tabular}