they can name a part and what will happen when it fails
The function of the third oil line and how it actually did it's job (within the Rotol prop driven by an RDa7 powering the Fokker F27) that pilots in ground school had to try to grasp, in fact did more than one head in , in it's complexity.
Then again, a very much old-hand Dutch trainer at Fokker's training base at Schiphol once answered a question regarding a specific malfunction. He spread his hands wide, saying -
"Eet will NEVER happen."