Due to the high demand for extra help, the teacher often engaged in overtime teaching after school hours.
由于对额外帮助的高需求，老师经常在放学后进行超时教学。
Overtime teaching is a common practice in many schools to ensure students catch up on missed lessons.
超时教学是许多学校的一种常见做法，以确保学生赶上错过的课程。