一个难以理解的英语4级句子elective courses are available not only for excellent academic performers but also for students about the average level.这句话怎么理解?为什么用about the average level.about在这里是什么意思?

一个难以理解的英语4级句子elective courses are available not only for excellent academic performers but also for students about the average level.这句话怎么理解?为什么用about the average level.about在这里是什么意思?
一个难以理解的英语4级句子
elective courses are available not only for excellent academic performers but also for students about the average level.
这句话怎么理解?为什么用about the average level.about在这里是什么意思?

一个难以理解的英语4级句子elective courses are available not only for excellent academic performers but also for students about the average level.这句话怎么理解?为什么用about the average level.about在这里是什么意思?
这句话是说：
选修课不光是为专业课程学的好的学生开设的,也是为那些大约在平均水平的学生开设的.
这里about是大约的意思,引导一介词短语修饰students

大略，附近的意思。表示平均水平上下

(表示所属)属于, 体现在…身上

就是大约是平均水平的意思~~~~~~~~