pro·logue /ˈproˌlɔg, ˌlɑg/
  開場白,序言,序幕(vt.)說開場白,加上…前言
  prologue
  序言;編序
  prologue
  導言 序幕
  Pro·logue n.
  1. The preface or introduction to a discourse, poem, or performance; as, the prologue of Chaucer's “Canterbury Tales;”  esp., a discourse or poem spoken before a dramatic performance
  2. One who delivers a prologue. [R.]
  Pro·logue, v. t. [imp. & p. p. Prologued p. pr. & vb. n. Prologuing.] To introduce with a formal preface, or prologue. [R.]
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  prologue
       n : an introduction to a play
       [also: prologs, prologing, prologed]