這個解釋好像比較靠譜

來源: she3652003 於 2014-11-06 08:52:02 [舊帖] [給我悄悄話] 本文已被閱讀：次

http://erkdemon.blogspot.ca/2010/01/clever-bright-and-smart.html

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.