introductory

柯林斯词典

1. ADJ An introductory remark, talk, or part of a book gives a small amount of general information about a particular subject, often before a more detailed explanation. 引言的[ADJ n]
...an introductory course in religion and theology. …一門宗教和神學的入門課程。
2. ADJ An introductory offer or price on a new product is something such as a free gift or a low price that is meant to attract new customers. 試銷的[商業] [ADJ n]
...a special introductory offer. …一次特價試銷。