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Jyutping baak6 dei6 hak1 zi6
Pinyin bái dì hēi zì

Definitions (Wiktionary)
  1. noun, uncommon
    black characters on a white background
    (syn.) 白底黑字
Examples (Wiktionary)
  1. Mandarin
    白地黑字
    白地黑字
    bái dì hēi zì
    • black characters on a white background