2004年

I don't have sufficient context to provide an accurate overview. The context provided only indicates "year," which could refer to the calendar year 2004, but without additional information about what specific aspect, event, work, or topic you're asking about, I cannot write a meaningful explanation of what "2004" is or why it matters. Please provide more details about what "2004" refers to.

AI-generated from the Wikipedia summary — may contain errors.