看書看到一個句子
Some online postgraduate courses offer students access to information that
might prove difficult to research if all they had available was the university
library.
想問一下 在that 之後這邊 might prove difficult to research 可以懂
但是在 research 後面接 if 子句 就看不懂語意了
有些postgraduate課程提供學生 困難研究的資訊權限
如果他們需要的是圖書館權限
有人可以幫解一下這個if的用法嗎？