The stated goal of comfortably reading 三體 (3 body problem) is a tough one. The first chapter is full of Cultural Revolution era vocabulary and later parts of th

The stated goal of comfortably reading 三體 (3 body problem) is a tough one. The first chapter is full of Cultural Revolution era vocabulary and later parts of the book contain a lot of science / philosophy jargon. If he can read that book comfortably, without researching and speed-running its exact vocabulary, then I'd say he's definitely an advanced learner.