名词
中文翻译：Unknown
同义词：
['initial', 'preliminary', 'introductory', 'introductory course', 'introductory material']
例句：
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1. The textbook is an introductory guide to the subject.
这本教科书是该学科的入门指南。
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2. This course is designed for students who are new to the field.
这门课程是为初学者设计的。
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3. Introductory courses often cover basic concepts and principles.
入门课程通常涵盖基本概念和原理。