There is a gradual change in the courses taught and books published to correspond to the change in period nomenclature, which in part reflects differences between social history and cultural history.
在教授的课程和发布的书籍方面有一个逐渐的改变，对应的时期命名法也在发生变化，这在一定程度上反映了不同的社会历史和文化历史。