Here is a sentence from "New Concept English" Lesson 3:
"The city must have been prosperous, for it enjoyed a high level of civilization."
I am wondering what's the function of "of" here? Is it correct to say:
"a high-level civilization"
"a high level civilization"?
It should be the "civilization" what the city enjoyed, but the "of" here makes me feel that the city enjoyed the "level".