形容词

1. 引言的;导论的;介绍性的
An introductory remark, talk, or part of a book gives a small amount of general information about a particular subject, often before a more detailed explanation.

2. (新品)促销的，特惠的
An introductory offer or price on a new product is something such as a free gift or a low price that is meant to attract new customers.

1. serving as an introduction or preface

Synonym: prefatorialprefatory

2. serving to open or begin

e.g. began the slide show with some introductory remarks

3. serving as a base or starting point

e.g. a basic course in Russian
basic training for raw recruits
a set of basic tools
an introductory art course

Synonym: basic