名词
中文翻译：水平编号
同义词：
['grade number', 'level numbering', 'grade level number']
例句：
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1. The teacher askedthe students to raise their hands when they knew the answer.
老师要求学生在知道答案时举手。
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2. The student needs to understand the concept of level numbers in order to solve the problem.
学生需要理解等级编号的概念才能解决问题。
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3. In a classroom, each student has a different level number, indicating their academic level.
在一个教室里，每个学生都有一个不同的等级编号，表示他们的学术水平。