学非所用 — “To learn something that cannot be put to practical use”

学非所用 (xué fēi suǒ yòng) is a Chinese idiom (chengyu) meaning “to learn something that cannot be put to practical use”.

学非所用 is pronounced xué fēi suǒ yòng in Mandarin Chinese.

Literally, 学非所用 means “What is learned is not put to use”. It is used to mean “to learn something that cannot be put to practical use”.

所学的不是将来用得着的东西。比喻学习与实践相脱节。