keynote
n
1 central theme of a speech, book, etc (演说、 书等的)要旨, 主题
Unemployment has been the keynote of the conference. 会议的主题是失业问题.
[attrib 作定语]
a keynote speech, ie one setting the tone for or introducing the theme of a meeting, etc 定基调的演说.
2 (music 音) note on which a musical key is based 主音.