introductory

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. …一门宗教和神学的入门课程。

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. 试销的[商业] [ADJ n]

...a special introductory offer. …一次特价试销。