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
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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
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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。
"late Middle English (as a noun denoting an introductory text): from late Latin