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Jyutping gwaan1 gwaan1
Pinyin guān guān

Definitions (Wiktionary)
  1. adv, archaic, onomatopoeic
    the sound of birds chirping
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    相关关系不导致因果关系。
    相關關係不導致因果關係。
    xiāng guān guān xi bù dǎo zhì yīn guǒ guān xi 。
    • Correlation does not imply causation.