铜城铁壁tóng chéng tiě bì
(1) 亦作“铁壁铜墙”,比喻防御工事坚固,也比喻力量的强大、意志的坚定
英
bastion of iron,impregnable fortress as a wall of bronze;impregnable like walls of brass and iron
⒈ 见“铜墙铁壁”。
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