相关单词近義詞 defense 防衛, stronghold 要塞, castle 城堡, fortification 防禦工事（尤指堡壘、要塞..., fort 堡壘, fortress 堡壘, citadel 城堡, keep 保持臨近詞redo, Redon相似詞redneck, redo, redolent, redouble, redoubtable, redound, redox, redraw, 返回 redoubt