学生会干部: leader in the Student Union 学习部部长 :Chief in charge of Study Dept. in the Student's Union生活部部长 :Head/Minister of Student Life Department 或 Head of Department of Student Life 或 Head of Student Life Union 学生会主席 :the President of Student Union 社团联合会主席: the President of Students' Federation 某某社团团长:the head of XX students' community