introductory

A preliminary course of study that provides a general overview of a subject.

推广优惠

A special low price for a new product or service to attract customers.

为吸引顾客而为新产品或服务提供的特价。

入门教科书

A book containing the basic principles of a subject, intended for beginners.

为介绍一门学科而设计的教科书

The first chapter of a book or report that sets the scene or provides background information.

入门班

A basic class designed for people with no previous experience of a subject.

为没有相关学科经验的人设计的基础课程。

介绍性讲座

The first lecture in a series that introduces the main topics.

一个课程或系列讲座的第一讲

介绍性段落

The first paragraph of an essay or article that introduces the main idea.

文本中介绍主题的第一段

开场白

A comment made at the beginning of a speech or meeting to set the context.

在演讲或会议开始时为设定背景而说的话。