请问这几句英文对话是什么意思
Librarian：Have you checked to see if your professor put any material for you to look at on reserve?
Student：Aha,that’s one thing I did know to do.I just copied an article,but I still need three more on my topic from three different journals.
主要不太明白"if your professor put any material for you to look at on reserve?"以及学生回答"that’s one thing I did know to do"的意思