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固若金汤形容城池或阵地坚固不易攻破(金:指金属造的城;汤:指滚水的护城河)。[查看详情]
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铜墙铁壁亦作“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;[查看详情]