感谢谢益辉（Yihui Xie）提供的非常有用的软件包bookdown，对数字的交叉引用非常有用。并且可以参考本question
但是，在为R撰写科学论文的出版物时，我必须将数字分开。第一组是出版物的数字，第二组是辅助数字。
我想为补充数字另设柜台。目前bookdown软件包中有没有办法做到这一点？
所以基本上像
\@ref(fig:figure1) # evaluates to Fig. 1
\@ref(fig:figure2) # evaluates to Fig. 2
\@ref(figS:supplementary-figure1) #evaluates to Fig. S1.
PS。对我来说最重要的输出是bookdown::word_document2
最小工作示例：
---
title: "MWD"
output: bookdown::word_document2
---
# Results
This text refers to Fig. \@ref(fig:fig1main).
We also want to refere here to Fig. \@ref(fig:fig2main).
In some cases we also need supplementary data. Please see Suppl. Fig. S\@ref(fig:fig1supp).
Please note that the 'S' before the reference should optimally NOT be there and ideally one should write:
```
Fig. \@ref(fig:fig1supp)
```
what would evaluate to Fig. S1.
# Figures
```{r fig1main, fig.cap="First Main Figure"}
plot(1)
```
```{r fig2main, fig.cap="Second Main Figure"}
plot(1)
```
# Supplementary data
```{r fig1supp, fig.cap="This is a supplementary figure and it should be called Fig. S1 and not Fig 3."}
plot(1)
```