一流 yīliú HSK5 first-rate Origin Definitions Defs Strokes Stroke Words Sentences Sents 第一流 dìyīliú first-class 双一流 Shuāng Yīliú Double First-Class Double First-Class University Plan, Chinese government project to develop both a group of Chinese universities and a group of subject disciplines to be world-class by 2050, implemented from 2017