Research on Chinese magic movies and TV series in the 21st century Research of Chinese population development strategy in the 21st century research on Chinese nationalism trend in the first half in the 20th century research on Germans coming to China in the 19th century research on the core values of the police literature in the 21st century Reform of China's public utilities and infrastructure in the 21st century Genres of Chinese urban films in the 21st century research on socialism from the 19th century to the 21st century Research on the frontier issues of literary theory in the 21st century 并列题名：Research on the frontier issues of literary theory in the 21st century