introductory

introductory
adjective
  1. serving as an introduction to a subject or topic; basic or preliminary
    引导的，引论的，序言的；基本的，基础的，初步的，预备的
    an introductory course in Russian.
    俄语基础教程。
    ■intended to persuade someone to purchase something for the first time
    说服…试购的，试销的
    we are making a special introductory offer of a reduced subscription.
    我们正在推出特惠价试订阅的活动。
语源
  1. late Middle English (as a noun denoting an introductory text): from late Latin introductorius, from Latin introducere (see introduce)
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