건물 내부에 난간과 벽을 포함하여 설치된 일련의 계단 구조물.
A set of stairs and its surrounding walls, structure, or banisters within a building.
예문:
"The grand marble staircase served as the centerpiece of the hotel's lobby."
"She held onto the wooden railing as she carefully climbed the narrow staircase."
"The architect designed a spiral staircase to save space in the small apartment."