铜墙铁壁

tóng qiáng tiě bì

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Definitions

1. copper wall, iron bastion (idiom); impenetrable defense

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Child Words of 铜墙铁壁

• 墙 墙 qiáng: wall
• 铜 铜 tóng: copper (chemistry)
• 铁 铁 tiě: iron (metal)
• 壁 壁 bì: wall