prefaces
A preface is an introduction at the beginning of a book that explains what the book is about or why it was written.
foreword
the preface to Kelman's novel.
凯尔曼小说的前言。
prefaces , prefacing , prefaced
If you preface an action or speech with something else, you do or say this other thing first.
I will preface what I am going to say with a few lines from Shakespeare.
我将引用莎士比亚的几行诗作为我讲话的开场白。