名词
中文翻译：班级
同义词：
['grade', 'period', 'lesson']
例句：
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1. She is a teacher in the fifth grade class.
她是一名五年级的老师。
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2. The teacher gave us a brief introduction to the new course.
老师给我们简要介绍了新课程。
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3. I often attend classes at the university library.
我经常在大学图书馆上课。