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Jyutping gou1 dung6 dung6
Pinyin gāo dòng dòng

Definitions (粵典–words.hk)
  1. 形容詞
    好​高
    (of structures) very tall, very high
  2. 參看
    高洞洞
Definitions (Kaifangcidian)
  1. 高高的

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Jyutping gou1 dong6 dong6
Pinyin gāo dòng dòng

Definitions (CC-CANTO)
  1. very tall (to describe structures / buildings)