staircase locks
plural of staircase lock
plural of chateaubriand
(mathematics) The asymptotical counterpart of a ball (inside surface of a sphere)
(idiomatic) Something so distressing that it causes one to lose hope and faith.
古い劇場は、上演中に遅れて来る人が通路の階段を登らないように、階段用の施錠装置を取り付けた。
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