Research on the early warning system and mechanism of national security crisis of the United States Research on the early warning system and response mechanism of rare earth strategic reserves Research on the management system and operation mechanism of inter-school sports competition in the United States Research on the early-warning system and response mechanism of rare earth strategic reserves Research on the national security system and mechanisms of main countries in the world 并列题名：Research on the management system and operation mechanism of inter-school sports competition in 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 Research on early warning mechanism of regional complex ecosystem security Research on the discourse system of national security governance in the new era