问题描述
这是PDF Rmarkdown的可复制示例：
---
title: "Untitled"
output: pdf_document
---
```{r setup,include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
## R Markdown
This is an R Markdown document. Markdown is a simple formatting Syntax for authoring HTML,PDF,and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.
When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:
```{r cars}
summary(cars)
```
我需要 ”这是R Markdown文档。Markdown是用于编写HTML，PDF和MS Word文档的简单格式语法。有关使用R Markdown的更多详细信息，请参见http://rmarkdown.rstudio.com。 “
使用Calibri字体，而不是默认字体。
解决方法
如果可以将乳胶引擎设置为xelatex，则可以使用\fontspec{Calibri}将字体设置为Calibri，然后使用\normalfont返回默认字体。
---
title: "Untitled"
output:
pdf_document:
latex_engine: xelatex
---
## R Markdown
\fontspec{Calibri}
This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML,PDF,and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.
\normalfont
When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:
