86.The more student who enroll in a course but dont come to campus,the more the school saves on keeping the lights on in the classrooms,paying doorkeepers, and maintaining parking lots.

　　主干：The more students... the more the school saves

　　解析：主干部分是the more... the more... 的特殊句型，表示越...越...。who引导的定语从句修饰students。

　　译文：报考该校却不来校园上课的学生越多，学校在用于教室照明、支付看门人及维护停车场费用上就可以节省越多。