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Jyutping hung1 hung1 dong6 dong6
Pinyin kōng kōng dàng dàng

Definitions (CC-CEDICT)
  1. absolutely empty (space)
  2. complete vacuum
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    地狱空空荡荡,魔鬼都在人间。
    地獄空空蕩蕩,魔鬼都在人間。
    dì yù kōng kōng dàng dàng , mó guǐ dōu zài rén jiān 。
    • Hell is empty, and all the devils are here!