preamble/pri:ˈæmbl; `priæmbl/ n[C, U]~ (to sth) opening statement explaining the purpose of the book, document, lecture, etc that follows （书籍、 文件、 讲演等的）前言, 序言, 开场白 He launched into his statement without any preamble. 他开门见山地发表言论.
牛津英汉双解词典