名词
中文翻译：初级教材
同义词：
['primary volume', 'elementary textbook']
例句：
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1.The elementary volume covers all the basic concepts in mathematics.
这本初级教材涵盖了数学的所有基本概念。
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2. She bought the elementary volume for her son's school project.
她为儿子的学校项目买了这本初级教材。
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3.The teacher asked us to read the elementary volume before class.
老师要求我们在课前读这本初级教材。