作者：Yihui Xie
译者：郑宝童
日期：2021.06.21

7. A Appendix: A Software Tools

For those who are not familiar with software packages required for using R Markdown, we give a brief introduction to the installation and maintenance of these packages.
对于那些不熟悉使用R Markdown所需软件包的人，我们简单介绍一下这些软件包的安装和维护。