ex·po·si·tion /ˌɛkspəˈzɪʃən/
 博覽會,展覽會,說明


 Ex·po·si·tion n.
 1. The act of exposing or laying open; a setting out or displaying to public view.
 2. The act of expounding or of laying open the sense or meaning of an author, or a passage; explanation; interpretation; the sense put upon a passage; a law, or the like, by an interpreter; hence, a work containing explanations or interpretations; a commentary.
 You know the law; your exposition
 Hath been most sound.   --Shak.
 3. Situation or position with reference to direction of view or accessibility to influence of sun, wind, etc.; exposure; as, an easterly exposition; an exposition to the sun. [Obs.]
 4. A public exhibition or show, as of industrial and artistic productions; as, the Paris Exposition of 1878. [A Gallicism]

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 exposition
      n 1: a systematic interpretation or explanation (usually written)
           of a specific topic [syn: expounding]
      2: a collection of things (goods or works of art etc.) for
         public display [syn: exhibition, expo]
      3: an account that sets forth the meaning or intent of a
         writing or discourse; "we would have understood the play
         better if there had been some initial exposition of the
         background"