Hello seagal: Thanks for your suggestion!
I converted the ["xml:lang="en"] to [xml:lang="zh-TW"] and worked in the webpage "tw.yahoo.com"
Maybe entourage should try to modify this method to their next update.

BTW, I use "Astro" this file browser to unzip the zip files.
Unfortunately, even I can go through the zip file and open the content1.xhtml and also change the xml:lang, I still can not save it back to the zip....
If anyone has another solution can directly modify or even batch convert of webpage based epub, I'll glad to hear that