pre·lude /ˈprɛlˌjud, ˈprel; ˈprɛˌlud, ˈpre; ||ˈpriˌlud/
 序幕,序言,預兆(vi.)作序(vt.)為…作序
 prelude
 序部
 Pre·lude n.  An introductory performance, preceding and preparing for the principal matter; a preliminary part, movement, strain, etc.; especially Mus., a strain introducing the theme or chief subject; a movement introductory to a fugue, yet independent; -- with recent composers often synonymous with overture.
    The last Georgic was a good prelude to the Aenis   --Addison.
    The cause is more than the prelude, the effect is more than the sequel, of the fact.   --Whewell.
 Syn: -- Preface; introduction; preliminary; preamble; forerunner; harbinger; precursor.
 Pre·lude v. i. [imp. & p. p. Preluded; p. pr. & vb. n. Preluding.]  To play an introduction or prelude; to give a prefatory performance; to serve as prelude.
    The musicians preluded on their instruments.   --Sir. W. Scott.
    We are preluding too largely, and must come at once to the point.   --Jeffrey.
 Pre·lude, v. t.
 1. To introduce with a previous performance; to play or perform a prelude to; as, to prelude a concert with a lively air.
 2. To serve as prelude to; to precede as introductory.
    [Music] preluding some great tragedy.   --Longfellow
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 prelude
      n 1: something that serves as a preceding event or introduces
           what follows; "training is a necessary preliminary to
           employment"; "drinks were the overture to dinner" [syn:
           preliminary, overture]
      2: music that precedes a fugue or introduces an act in an opera
      v 1: serve as a prelude or opening to
      2: play as a prelude