Research on localization of Marxist economic thought in China in the first half of the 20th century 并列题名：Research on localization of Marxist economic thought in China in the first half of the 20th century Research on the history of Chinese sociology of law in the first half of the 20th century 并列题名：Research on the history of Chinese sociology of law in the first half of the 20th century Historiography communication between China and America in the first half of the 20th century Philosophical thought in Russia in the 2nd half of the 20th century Research on the history of Chinese art in the English world of the 20th century Scientized thought of Chinese art in the first half of the 20th century