名词
中文翻译：等级
同义词：
['category', 'rank', 'class']
例句：
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1. The students in the first grade are learning to read.
一年级的学生正在学习阅读。
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2. The teacher gave us a grade for our homework.
老师给我们的作业打了分。
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3. The new manager has improved the company's grade in the market.
新任经理提高了公司在市场的排名。