belles-let·tres
noun/ˌbel ˈletrə/
/ˌbel ˈletrə/
[uncountable + singular or plural verb] (from French, old-fashioned)- studies or writings on the subject of literature or art, contrasted with those on technical or scientific subjects
纯文学，美文学，美文（指有别于科技题材的文学或艺术研究或作品） Word Originmid 17th cent.: from French, literally ‘fine letters’.