老师用手指指着学生笔记本上的数学图表 Teacher points with his finger to a mathematical chart over the student notebook

老师用手指将注意力引导到学生头顶上显示的数学图表上；的笔记本，有助于理解和加深对主题的理解。

Using his finger, the teacher guides attention to a mathematical chart displayed atop the student's notebook, facilitating comprehension and fostering a deeper understanding of the subject matter.