我找到了official explanation, 回答过这个贴子. 贴子很长 (Official explanation is always long.). 嫌烦的话, 就看我特

意highlight 过的. Here is the link:

http://www.huaren.us//dispbbs.asp?boardID=336&ID=143124&page=1

[此贴子已经被作者于2005-9-29 2:35:24编辑过]