Reference research on the sustainable business model of MOOC in American research universities 并列题名：Reference research on the sustainable business model of MOOC in American research universities 并列题名：Research on the education of undergraduate courses and teaching in American research universities Research on the stratification management in American public universities Reflections on general education of American research universities Research on quality assurance of American public research universities Research on the sustainable planning & design of American university campus Research on the talent cultivation mode in American research-oriented universities 并列题名：Research on quality assurance of American public research universities 并列题名：Research on the talent cultivation mode in American research-oriented universities