staircases FREQ #49879 n. 楼梯( staircase的复数形式 ) 释义与例句 n. 1. plural of staircase 相关短语 spiral staircases Penrose staircases moving staircases everlasting staircases spiral staircase n. 螺旋梯; 盘梯 Penrose staircase devil's staircase moving staircase [机] 升降阶梯 everlasting staircase helical staircase