introductory /ˌɪntrəˈdʌktəri/ adjective /ˌɪntrəˈdʌktəri/
adjective
Learner's definition of INTRODUCTORY
1
: providing information about someone who is about to speak, perform, etc., or something that is about to begin引导性的;介绍性的 2
: providing basic information about a subject入门的;基础的 3
: intended to attract customers when a new product, service, etc., is introduced试销的