Taivo A Taiwan Mandarin dictionary

牢不可破

láobùkěpò

ㄌㄠˊ ㄅㄨˋ ㄎㄜˇ ㄆㄛˋ

  1. 1(idiom) (usu. of sth abstract: an alliance, a conviction etc) unbreakable; rock-solid

Keep 牢不可破 and it comes back until you know it.

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