Enrollment
topped160,000, and the unprecedented success of the experiment inspired other
schools, many of them top tier
universities, to mount their own offerings.
今天在文章里读到这个句子，many
of them top tier universities这里的结构不是很明白，还望老师们不吝赐教，感谢！！！
many of them top tier universites 是独立主格结构，相当于 many of them being
top tier universites，也可以改成非限制性定语从句：many of which were
top tier universites（其中许多是顶级大学）。
