登ㄉㄥ堂ㄊㄤˊ入ㄖㄨˋ室ㄕˋdēngtáng‑rùshì

  1. 比喻學問或技藝方面循序漸進，達到高深的境界。也作「升堂入室」。

英from the main room, enter the inner chamber (idiom)​, to go to the next level, to attain a higher level