Extra-mural courses are courses at a college or university which are taken mainly by part-time students.
例句
I took my first extra-mural course in 1948 in Coventry, even though I was working in Birmingham...1948年我在考文垂第一次上校外课，虽然当时我在伯明翰工作。Adult education is run in cooperation with the extra-mural departments of the universities.成人教育是和大学对外教学部合办的。
英英词典释义
Adjective
1. carried on outside the bounds of an institution or community;