grade block

例句：

1. 1. The teacher divided the students into different grade blocks for teaching purposes.
   老师为了教学目的将学生分成不同的年级组。
2. 2.The new curriculum has changed the way we teach and organize our grade blocks.
   新的课程体系改变了我们教授和组织年级组的方式。
3. 3. The student council organized a fun event to promote teamwork among the grade blocks.
   学生会组织了一个有趣的活动，以促进年级组之间的团队合作。