并列题名：Principles of ethics 并列题名：Principles of optics 并列题名：Principles of aesthetics 并列题名：Principles of genetics 并列题名：Principles of economics Principles of ethics 并列题名：Principles of proteomics 并列题名：Principles of statistics 并列题名：Principles of Economics 并列题名：Principles of econometrics