ˊㄍㄨˇㄅㄨˊㄏㄨㄚˋshígǔ‑búhuà

shígǔ‑bùhuàㄕˊ ㄍㄨˇ ㄅㄨˋ ㄏㄨㄚˋ
  1. 學習古代知識懂得融會貫通如同東西不能消化一樣比喻一味守舊變通 老先生學問食古不化」。

to swallow ancient learning without digesting it (idiom)​, to be pedantic without having a mastery of one's subject