看书看到一个句子
Some online postgraduate courses offer students access to information that
might prove difficult to research if all they had available was the university
library.
想问一下 在that 之后这边 might prove difficult to research 可以懂
但是在 research 后面接 if 子句 就看不懂语意了
有些postgraduate课程提供学生 困难研究的资讯权限
如果他们需要的是图书馆权限
有人可以帮解一下这个if的用法吗？