升ㄕㄥ堂ㄊㄤˊ入ㄖㄨˋ室ㄕˋshēngtáng‑rùshì

  1. 比喻學問或技藝方面循序漸進，達到高深的境界。也作「登堂入室」。

英lit. to reach the main room and enter the chamber (idiom)​, fig. to gradually attain proficiency, to attain a higher level