dis·ser·tate /ˈdɪsɚ/
  (v.)討論;正式談論
  Dis·ser·tate v. i.  To deal in dissertation; to write dissertations; to discourse. [R.]
  ◄ ►
  dissertate
       v : talk or hold forth formally about a topic; "The speaker
           dissertated about the social politics in 18th century
           England" [syn: discourse]