Theoretical and empirical study of family farm development Theoretical and empirical study on backpacker tourism Theoretical and empirical study of teachers' sense of gain Theoretical and empirical study on commodity circulation space Theoretical and empirical study on innovation-driven growth Theoretical and empirical study on marine fishery production in China Theoretical and empirical study on cyclical company valuation Theoretical and empirical study on the power list system Theoretical and empirical study of professional manager market in China 并列题名:Theoretical and empirical study of teachers' sense of gain