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更新日期：2018-02-19
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spiral staircase designed around the central pillar, with a railing on one side only. Narrow staircase close to the pole and wider at the tip, making them difficult to use for people with disabilities. their design is intended for the effective use of space, and not for comfort. But, spiral design allows for some very interesting design, and there are many stairs significant in the history of architecture.
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