Take the class as the unit
Classes are divided into fixed classes according to age and knowledge level, that is, the students in the same teaching class have roughly the same age and education level, and the number is fixed. The teacher teaches the same content to the whole class at the same time.
Small teaching activities
Teaching activities are divided into many small parts according to disciplines and academic years, which are generally balanced, continuous and relatively complete.
Fixed class hours
Each class is scheduled to be held in a fixed unit time, which is called class time. There are certain intervals and breaks between classes. Generally speaking, each subject may be independent, or multiple subjects may go hand in hand and take turns.