a study in Kant's moral philosophy Study of Hume's moral philosophy a study on Shao Yong's philosophy 并列题名：Study of Hume's moral philosophy 明理与敬义：康德道德哲学研究：a study on Kant's moral philosophy Natural law moral philosophy Study on Zhang Zai's philosophy 定言命令式：康德道德哲学研究：a study in Kant's moral philosophy a study of Nietzsche's political philosophy Study of Marx's political philosophy