| 单词 | spiral staircase |
| 释义 | > as lemmasspiral staircase spiral staircase n. ΚΠ 1757 tr. J. G. Keyssler Trav. II. 320 This column, with its spiral stair-case,..was restored to its former beauty by pope Sixtus V. 1840 D. Lardner Treat. Geom. 245 Such a spiral surface is the form of spiral staircases, sometimes called geometrical staircases. < as lemmas |
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