I execute this in Rstudio console
It shows like that
Sys.getlocale()
[1] "LC_COLLATE=Chinese (Simplified)_China.936;LC_CTYPE=Chinese (Simplified)_China.936;LC_MONETARY=Chinese (Simplified)_China.936;LC_NUMERIC=C;LC_TIME=Chinese (Simplified)_China.936"
It seems that it is Chinese, so how to change that into something like utf-8 ?