空
Air, Bare, Deserted, Empty, Have free time, Hollow, In vain, Sky, Space
Empty, Have free time, Space, Air, Sky, In vain, Bare, Hollow, Deserted
檔
Cross, Files, Pigeon, Records, Rungs, Schedule, Shelves
Files, Records, Shelves, Pigeon holes, Schedule, Cross pieces, Rungs
