铜墙铁壁

tóngqiángtiěbì

a bastion of iron—an impregnable fortress

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a bastion of iron

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impregnable fortress

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tong2 qiang2 tie3 bi4

copper wall, iron bastion (idiom); impenetrable defense

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铜墙铁壁

tóng qiáng tiě bì

iron bastions; a bastion of iron; a stronghold; a wall of bronze or iron; impregnable fortress; iron walls; like walls of brass and iron; a tower of strength; be strong as) walls of bronze

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銅牆鐵壁|铜墙铁壁 [tóng qiáng tiě bì] ► copper wall, iron bastion (idiom); impenetrable defense