名词短语
中文翻译：年龄组
同义词：
['grade', 'grade level', 'grade group']
例句：
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1. Theteacher divided the students into different age groupsfor a fun activity.
老师将学生们分成不同的年龄组进行有趣的活动。
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2. The student's performance in the exam was evaluatedbased on his age group.
学生在考试中的表现是根据他的年级来评估的。
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3.The school has implemented a new system tomanage students according to their age groups.
学校实施了一个新的系统，根据学生的年级来管理他们。