ㄕㄥshēngㄊㄤˊtángㄖㄨˋˋshì

  1. 論語·先進》:升堂。」比喻學問技藝循序漸進達到高深境界三國志·一一·魏書·管寧》:黃老六藝升堂入室閫奧。」登堂入室」、入室升堂」。造詣高深

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