相关单词近义词 security 安全, defense 防卫, entrenchment 掘壕沟, dike 堤坝, wall 墙壁, bulwark 壁垒, fortification 防御工事（尤指堡垒、要塞..., embankment 堤防, bastion 棱堡, earthwork 土方工程, battlement 城垛, parapet 低矮挡墙, barricade 【C】路障, barrier 栅栏临近词Ramsay, rampant, rampart n., rampart protection, Rampart of Chuansha 返回 ramparted