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Jyutping biu1 diu6
Pinyin biāo diào

Definitions (Wiktionary)
  1. verb
    to mark tone (of Chinese); to indicate tone
    • 字母標調法
      字母标调法
      zì mǔ biāo diào fǎ
      marking tone with letters (as with Gwoyeu Romatzyh)
Examples (Wiktionary)
  1. Mandarin
    字母标调法
    字母標調法
    zì mǔ biāo diào fǎ
    • marking tone with letters (as with Gwoyeu Romatzyh)