How to weak certain CJK fonts under zh_CN locale

I installed YaHei fonts in Fedora 15, which are the only CJK fonts. When LANG=en_US.utf8, fc-match monospace returns "DejaVu Sans Mono", which are the default mono fonts. When LANG=zh_CN.utf8, fc-match monospace returns "Microsoft YaHei"。I don't want this result, because ASCII characters are not

How to weak certain CJK fonts under zh_CN locale

I installed YaHei fonts in Fedora 15, which are the only CJK fonts. When LANG=en_US.utf8, fc-match monospace returns "DejaVu Sans Mono", which are the default mono fonts. When LANG=zh_CN.utf8, fc-match monospace returns "Microsoft YaHei"。I don't want this result, because ASCII characters are not