名词
中文翻译：等级
同义词：
['class', 'grade', 'level']
例句：
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1. She is in the first grade at school.
她在学校的一年级。
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2. The teacher asked us to move up a grade next term.
老师让我们下学期升一级。
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3. The students are divided into different grades for different subjects.
学生们根据不同的科目被分成不同的年级。