帮助学生使用计算器的老师 Teacher helping a student with directions to use the calculator

一位老师坐在一位学生旁边，桌子上摆满了书，台灯照亮了他，为如何有效地使用计算器提供了明确的指导。

A teacher sits beside a student at a desk overflowing with books, illuminated by a desk lamp, providing clear guidance on how to utilize the calculator effectively.