Study on Zhang Zai's philosophy Study on Zhuangzi's pbilosophy a study on Shao Yong's philosophy Study on Zhang Jiucheng's philosophy 并列题名：Study on Zhuangzi's pbilosophy Study on Pre-Socrates philosophy Study of medieval philosophy a study in Kant's moral philosophy Study on Zhang dainian's cultural philosophy 并列题名：Study on Zhang Jiucheng's philosophy