短語詞組短語double bottom bracket floor 雙層底空心肋板double bottom open floor 雙層底組合肋板bottom terminal floor 底部樓層Freezer Bottom Floor 冷藏室底層athwartships bottom floor 跨船底肋板concrete bottom floor 混凝土底板Basement bottom floor node 底板節(jié)點bottom floor construction 底板施工double bottom floor 雙層底肋板 返回 bottom floor