名词
中文翻译：主题
同义词：
['subject matter', 'topic', 'matter']
例句：
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1.The teacher asked the students to present their research on the subject.
老师要求学生们展示他们对主题的研究。
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2.The student's performance was a subject of discussion in the class.
学生的表现是课堂上讨论的话题。
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3. The book is about the history of the subject.
这本书讲述了这个学科的历史。