铜墙铁壁

Chinese

For pronunciation and definitions of 铜墙铁壁 – see 銅牆鐵壁 (“impregnable and indestructible wall or barrier; something very firm and indestructible”). (This term, 铜墙铁壁, is the simplified form of 銅牆鐵壁.)
Notes: Simplified Chinese is mainly used in Mainland China and Singapore. Traditional Chinese is mainly used in Hong Kong, Macau, and Taiwan.

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