> I try to input some Chinese character in utf8 but the output malforms.
> After doing some tracing, I found it's due to the function "expand" in
> chainingspace.r.

Part of the problem here is that REBOL itself doesn't support UTF-8
(actually, some built-in behavior discourages it). There is a function
on REBOL.org that will decode UTF-8 characters and shouldn't be too
much trouble to turn into a decode/encode routine.

-> http://www.rebol.org/cgi-bin/cgiwrap/rebol/search.r?find=utf-8

- Chris