名词
中文翻译：等级
同义词：
['rank', 'level', 'category']
例句：
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1. The students are expected to achieve different grades in their exams.
学生们被期望在考试中取得不同的成绩。
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2. This course is designed for beginners and has three levels of difficulty.
这门课程是为初学者设计的，有三个难度级别。
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3. The teacher gave the students a grade of 'A' for their excellent work.
老师给学生们的优秀工作打了‘A’分。