名词
中文翻译：等级
同义词：
['class', 'level', 'rank', 'grading']
例句：
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1. The student's grades are improving.
学生的分数在提高。
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2. This course is designed for students of different grade levels.
这门课程是为不同年级的学生设计的。
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3.The teacher graded the exams and gave feedback to the students.
老师批改了试卷并向学生提供了反馈。