• 1. enclosed staircase: 封闭楼梯间 | 防烟楼梯间 | 楼梯间
• 2. fully-enclosed staircase: 全封闭楼梯间

• 1.Both a staircase and a lift connect the two floors with an enclosed terrace on the roof.
  一道楼梯和一台电梯连接两层楼和封闭的屋顶平台。
  dict.yoduao.com
• 2.The void between entrance staircase and the facade was previously boxed up and enclosed and no natural light could penetrate into the staircase area.
  入口楼梯和立面之间的空隙以前是封闭的，没有自然光可以穿透到楼梯区域。
  dict.yoduao.com

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