Comparative study on the value theory of Marx and Adam Smith Comparative study on the general theory of penalty Comparative study on the general theory of crime Comparative study on the principle of good faith Comparative study on the city walls of Nanjing and Rome Comparative study on the promotion of common prosperity Comparative studies on the validity of the contract. Comparative studies on the validity of the contract Comparative study of the basic law of Hong Kong and Macao Comparative study on the law of non-marital cohabitation