Study on devolution of the United Kingdom since the 20th century Study of the political history of the guge kingdom in the 10th-13th century Study on the development of Zhejiang piano art in the 20th century Study on the Chinese literature in the 20th century the evolution of literary criticism since twentieth century the representation of the Chinese subjects in the 20th century Study on the tradition of American radical thought in the 20th century Recognition of the Naxi culture in the 20th century 并列题名：Recognition of the Naxi culture in the 20th century Study on history of Chinese fantasy novels in the 20th century