C201

Cheng Nuo slightly frowned as he thought about what Professor Brown meant, but he still didn't understand what he meant.

A sincere one?

"Sorry, I still don't understand what you mean. What's the use of having a sincere oil painting?"

Professor Brown sighed. "It's useless, but it's essential!"

"The oil painting is what the author is thinking, what he is trying to express. Avery is too young