Research on the crime of extortion from the perspective of norm theory 并列题名:Research on the crime of extortion from the perspective of norm theory Research on the crime of interest transfer from the perspective of criminal law Research on teacher education from the perspective of life Research on pedagogical expertise from the perspective of teachers Research on identification of ancient editions from the perspective of oral history Research on the criminal trial order from the perspective of judicial authority Research on the evolution of division from the perspective of Marxist economics Research on the government and social organizations from the perspective of symbiosis theory Research on the country-of-origin mage from the perspective of legitimacy theory