introductory

英 [ɪntrə'dʌkt(ə)rɪ] 美[,ɪntrə'dʌktəri]

• adj. 引导的，介绍的；开端的

1. serving to open or begin;

"began the slide show with some introductory remarks"

2. serving as a base or starting point;

"a basic course in Russian"

"basic training for raw recruits"

"a set of basic tools"

"an introductory art course"

3. serving as an introduction or preface