学非所用

Explanation: Learn is not something useful in the future. Metaphor of learning and divorced from practice. 　　Source: "Han Zhang Heng Chuan" must also Xuefeisuoyong, surgery has been belief, it Linchuan the economy, but not Cunyan Vessels. " 　　Examples: Expertise is more of a home, after returning from nothing with its long, are finally to ~ can not be cast. ★ Feng "My Life" Chapter thirty-third Thesaurus:  Yongfei one's specialty Antonym Group:  Xueyi practicality, study sth.in order to apply it