关于a high level of civilization

The city at one time must have been prosperous,for it enjoyed a high level of civilization.
这座古城肯定一度很繁荣,因为它曾享有高度的文明,
关键在于enjoy,意思是过得愉快,享受美好时光,那么后半句就成为：在文明的高级水平上享受美好时光,也就是享有高度的文明
用level of是习惯用法,还有诸如：the local level of government 地方一级政府