Research on the political system and security system of major countries in the world Research on the national security system and mechanisms of main countries in the world Research on the public sports service system of urban communities in China Research on the related legal liability system of drug safety in China Research on the influencing factors and security system of information accessibility construction Research on the fiscal system of the preschool education in China Research on the logical system of the theoretical system of socialism with Chinese characteristics Research on the political development of middle fastern countries