key·note /ˈkiˌnot/
 主調音,基音,基調(vt.)說明基本政策,定基調


 Key·note n.
 1. Mus. The tonic or first tone of the scale in which a piece or passage is written; the fundamental tone of the chord, to which all the modulations of the piece are referred; -- called also key tone.
 2. The fundamental fact or idea; that which gives the key; as, the keynote of a policy or a sermon.

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 keynote
      n 1: the principal theme in a speech or literary work
      2: a fundamental or central idea
      3: (music) the first note of a diatonic scale [syn: tonic]
      v 1: set the keynote of; "Comfort keynotes this designer's Fall
           collection"
      2: give the keynote address to (an audience)