belles-lettres

n. 纯文学

belles-let.tres

pl.n.(used with a sing. verb)（复数名词）（与单数动词连用）
Literature regarded for its aesthetic value rather than its didactic or informative content.
纯文学：注重其美学价值而非说教或教育内容的文学
Light, stylish writings, usually on literary or intellectual subjects.
美文学：通常关于文学或智力主题的轻快、时髦的文体

来源：
French
法语
belles [fine]
belles [美好的]
lettres [letters, literature]
lettres [书信，文学]