名词
中文翻译：等级
同义词：
['rank', 'level', 'category']
例句：
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1. The student needs to improve his grades before the exam.
这个学生需要在考试前提高他的分数。
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2. The teacher gave a grade of A for the excellent work.
老师给这次出色的工作打了A分。
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3. She is in the first grade and still learning how to read.
她正在上一年级，还在学习如何阅读。