The document provides definitions and explanations of key terms and events related to modern Chinese history from the early 20th century to the post-Mao reform era, including political campaigns, economic reforms, religious and philosophical movements, revolutionary organizations and figures, and Sino-foreign relations. Events covered include the 1927 Canton commune, the 1955 agricultural cooperatives, the 1973 Anti-Lin Biao campaign, and the introduction of the contract responsibility system in the 1980s. People mentioned include Mao Zedong, Chiang Kai-shek, Chen Duxiu, Chen Yun, and the empress dowager Cixi.