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1. The architect designed a quarter-turn staircase that would make the building more accessible for people with disabilities.
建筑师设计了一个四分之一转楼梯，使得残疾人更容易进入大楼。
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2. The construction workers were working on a quarter-turn staircase to connect two floors of the building.
建筑工人正在修建一个四分之一转楼梯，以连接大楼的两个楼层。
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3. The new elevator was installed at the top of the hotel's quarter-turn staircase,making it easier for guests to access the upper floors.
酒店在四分之一转楼梯的顶部安装了新的电梯，使客人更容易到达上层。