preface [ˈprefəs]

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n.序文，绪言，前言；v.作序，写前言，以...开始

an introduction at the beginning of a book explaining its aims

He has written a fine preface to the play. 他为这个剧本写了一篇精彩的序言。
This book has a preface written by the author. 这本书有作者写的序言。