students’ union
noun /ˌstjuːdnts ˈjuːniən/
  /ˌstuːdnts ˈjuːniən/
(also student union)
- a building where students at a university or college can go to meet socially(大学或学院的)学生活动中心 
- (British English) an association of students at a particular university or college, interested and involved in students’ rights, living conditions, etc.(大学或学院)学生会