请问这句话中what怎样理解,是不是该改为that?you should use them to

请问这句话中what怎样理解,是不是该改为that?you should use them to
抱歉
Student:I was wondering if I should also include the note from the research journal you suggested I keep.
Prof.:Yes,definitely,you should use them to indicate what your evolution in thought was through time.So just set up ,you know,what was the purpose of what you were doing.To try to understand the climate variability of this area and what you did and what your approach was.