Dictionary/铜墙铁壁

铜墙铁壁 銅牆鐵壁

tóng qiáng tiě bì

ㄊㄨㄥˊ ㄑㄧㄤˊ ㄊㄧㄝˇ ㄅㄧˋ
Idiom
1copper wall, iron bastion (idiom); impenetrable defense

Characters

铜墙铁壁