Annual report on research of U. S. A (2020) Annual report on research of U. S. A. (2015) Annual report on research of U.S.A (2017) 并列题名：Annual report on research of U. S. A (2020) 并列题名：Annual report on research of U. S. A. (2015) Annual report on research of U. S. A Annual report on research of U.S.A Annual report on research of Japan Annual report on research of Iran 并列题名：Annual report on research of U. S. A