Research on the early warning system and mechanism of national security crisis of the United States Research on the discourse system of national security governance in the new era Research on the liability system for antitrust damage in the United States Research on the environmental citizen suit in the United States Research on the national security system and mechanisms of main countries in the world Research on the spillover effects and governance mechanisms of monetary policies between China and the United States Research on the management system and mechanism of continuing education in developed countries Research on the open system and mechanism of educational government data