in·tro·duc·to·ry /ˌɪntrəˈdʌkt(ə)ri/
(a.)介紹的,引導的,開端的
In·tro·duc·to·ry a. Serving to introduce something else; leading to the main subject or business; preliminary; prefatory; as, introductory proceedings; an introductory discourse.
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introductory
adj 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" [syn: basic]
3: serving as an introduction or preface [syn: prefatorial, prefatory]