introduction
单词辨析：
指书、演讲等的开篇，概括介绍后面主体部分的内容。
He explains in the introduction how he gathered the data.
他在引言里解释了他是如何收集到数据的。
The students showed great interest after the professor gave a brief introduction to the course.
教授简单介绍了这门课程之后，学生们表现出极大的兴趣。
尤指书籍开篇介绍其写作目的的说明性文字。
write a preface to a book
为一本书作序
The preface gives an overview of the book's contents.
序言对全书内容作了一个概述。
相关例句：
There are two among their recent introductions that have greatly impressed me.
在他们最近引进的东西里面有两样给我留下了非常深刻的印象。
This chapter is an introduction to the entire book.
本章为全书的序论。
The introduction of this book was written by a certain professor.
此书由某教授导读。
Her introduction is a model of fairness, a lively summation of Irish history.
她的导论是客观公正的典范，是对爱尔兰历史的生动概括。
Introduction of electronic point-of-sale systems is improving efficiency.
引进销售点电子系统提高了效率。
It was Mark's first introduction to royal duties and he came through his baptism of fire unscathed.
这是马克第一次承担皇室的工作，但他经受住了严峻的考验。