名词短语
中文翻译：年级段的长度同义词
同义词：
['grade segment', 'grade length', 'grade span', 'grade interval']
例句：
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1. The teacher asked us to calculate the length of our grade sections.
老师要求我们计算我们年级段的长度。
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2. The school has introduced a new system to measure the length of each grade section.
学校引入了一个新的系统来测量每个年级段的长度。
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3. The student's performance in the final exam was directly related to the length of their grade section.
学生在期末考试中的表现与他们的年级段长度直接相关。