staircase (n.)also stair-case, 1620s, originally the enclosure of the stairs, from stair + case (n.2) in its sense "frame;" compare former window-case, door-case.
stair·case/ˈsteəkeɪs; NAmEˈsterkeɪs/nouna set of stairs inside a building including the posts and rails (= banisters) that are fixed at the side (建筑物内的)楼梯◆a marble/stone/wooden staircase大理石╱石╱木楼梯☞see also spiral staircasestaircasestaircasesstair·case/ˈsteəkeɪs; NAmEˈsterkeɪs/
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