Thank you for your answer, but it does not really answer my problem.
I now have two siteaccesses for Chinese, where I want one to be traditional and one to be simplified. I am using the simplified now (chi-CN). But how can I have another in traditional?
How can I translate my articles in these two chinese versions through admin interface?
Take a look on this article. George explain it well how to install new translation and how to use it on your site. http://ez.no/community/articles/new_features_in_ez_publish_3_8/installing_a_translation
Basically you will need to locales, then translation you can add as usual in admin interface.