Study on En-fu Cheng's academic thought 并列正题名:Study on En-fu Cheng's academic thought a study of Zhang Luxiang's academic thought Study of Fei Xiaotong's academic thoughts Study on Lenin's strategic thought 并列题名:Study of Fei Xiaotong's academic thoughts Research on Shen Zhiyuan's academic thought New study on He Lian-cheng economy thought study on Schiller's aesthetic thoughts Research on Zhang Daoyi's academic thought