Read Edit View history 铜墙铁壁 tóngqiángtiěbì impenetrable defense Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 铜墙铁壁/銅牆鐵壁 · tóngqiángtiěbì · impenetrable defense 2026/03/04 铜墙铁壁 / 銅牆鐵壁 tóngqiángtiěbì impenetrable defense copper wall and iron bastion; an impenetrable defense 我们的防线像铜墙铁壁一样稳固。 idiom created sense Mar 4, 2026, 02:25 AM