Please take a look, this is the sand table model of Chang'an City during the prosperous Tang Dynasty. It covered an area of about 84 square kilometers and was the largest city in the world at that time..."
Li Chen pushed up the black-rimmed glasses on the bridge of his nose, and drew a red line on the sand table model with the laser pen in his hand. As a teaching assistant in the history department, taking students to visit museums is his most enjoyable job.
