对大学生日常往返于宿舍、食堂和教室之间的单一生活规律的戏称used to jokingly describe the way that a student's life revolves around the dormitory, the dining hall, and the classroom; iron triangle

• 到社会上去走一走，看一看，对打破单纯的“铁三角”是有积极的效果。

  Stepping into wider society for a walk and a look around has a positive effect in breaking the "iron triangle"