优秀学生会干部用英语怎么说

outstanding students' union leader(s)

excellent cadres of student committee

Excellent Cadre of Student Council

希拉里罗的这个不错，用了两个新词，加分，哈哈

Excellent Cadre of Student Council

优秀学生会干部
excellent leader of the departmental student union

Outstanding student cadres