round·house /ˈraʊndˌhaʊs/
  後甲板後部的船室,火車頭車庫,拘留所
  Round·house n.
  1. A constable's prison; a lockup, watch-house, or station house. [Obs.]
  2. Naut. (a) A cabin or apartment on the after part of the quarter-deck, having the poop for its roof; -- sometimes called the coach. (b) A privy near the bow of the vessel.
  3. A house for servicing and repair of locomotive engines, built circularly around a turntable bearing railroad tracks, with several tracks leading in and out.
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  roundhouse
       n 1: workplace consisting of a circular building for repairing
            locomotives
       2: a hook delivered with an exaggerated swing