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Two manifestations of first-class clocks and watches
Digital representation and pointer representation. Digital representation means using numbers to represent time, and 1:30 is 1: 30.

Pointer representation means that time is represented by the position of the hour hand and the minute hand. The hour hand points to 1 and the minute hand points to 6, indicating 1: 30.

For freshmen, digital representation is easier to understand and master, and time is directly represented by numbers. The pointer notation requires students to be able to identify the positions of the hour hand and the minute hand and convert them into digital time. With the improvement of students' familiarity with clocks, they will gradually master the pointer representation.