class norm

例句：

1. 1. The teacher emphasized the importance of class norms during the lesson.
   老师在课上强调了班级规范的重要性。
2. 2.The students were required to follow the class norms when they entered the classroom.
   学生们进入教室时必须遵守班级规范。
3. 3.The school has implemented a new class norm to improve student behavior.
   学校实施了一种新的班级规范，以改善学生行为。