welcome to WebmasterWorld [webmasterworld.com], Bonaqua!

you will need a unique set of urls for the content in the other language.
you could do this with another domain, a subdomain, a subdirectory, a unique file name or a parameter in the query string.

how are you selecting language and how do you maintain the state?
(search engines don't accept cookies or submit forms)

But there is a limitation in our CMS that we can only adopt one url... do you guys have any other trick to resolve this?

Are you saying that you can only use one domain (ex: www.domain.com) or you can only use one URL for the two languages (ex: www.domain.com/english/ vs www.domain.com/espanol/)?

i can only use one url www.domain.com/1234 for both Chinese and English pages

It is possible if you have same domain, you can use sub domain or for same domain different URL for different languages. This can be done using CMS. Which CMS you are using? We have done for one of our website <snip>
<snip>

[edited by: engine at 1:58 pm (utc) on Oct. 20, 2009]
[edit reason] See WebmasterWorld TOS [/edit]