guard·room /ˈgɑrˌdrum, ˌdrʊm/
  守候室,衛兵室,守衛室
  Guard·room n. Mil. The room occupied by the guard during its term of duty; also, a room where prisoners are confined.
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  guardroom
       n 1: a cell in which soldiers under guard are confined
       2: a room used by soldiers on guard