Characters
- 铜 (銅): copper (chemistry); see also 紅銅|红铜[hong2 tong2]; CL:塊|块[kuai4]
- 墙 (墻): variant of 牆|墙[qiang2], wall
- 铁 (鐵): surname Tie
- 壁 (壁): wall; rampart
Resources
- Wiktionary: 铜墙铁壁
- MDBG: 铜墙铁壁
- Examples with 铜墙铁壁 on Tatoeba
Examples
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