名词
中文翻译：对比等级
同义词：
['contrasting grades', 'contrasting levels']
例句：
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1.The students were given contrasting grades for their performance in the exam.
学生们因考试表现而获得不同的成绩。
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2. The teacher used contrasting grades to motivate the students to improve their work.
老师使用不同的成绩来激励学生提高他们的工作。
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3. The company implemented contrasting grades to evaluate the employees' performance.
公司实施了不同的成绩来评估员工的绩效。