求翻译：2009毕业于中国医科大学预防医学系，曾担任过校学生会生活部干事和班级生活委员； 2009-至今，就读于中国医科大学公共卫生学院儿少卫生与妇幼保健专业，从事儿童肥胖的流行病学研究；是什么意思？

2009 graduated from the China Medical University, Department of Preventive Medicine, has served as the Student Union Life Department Director-General and the members of the class life; 2009 - present, studied at the School of Public Health, China Medical University, a small child health and maternal