名词
中文翻译：Unknown
同义词：
['class', 'rank', 'category', 'level', 'order']
例句：
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1. The students were divided into different grades for the exam.
学生们被分成不同的班级参加考试。
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2. The company has several different grades of products.
该公司有几种不同级别的产品。
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3. The teacher asked us to work in our own grades.
老师让我们按照自己的年级进行学习。