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Jyutping zi1 zi1 bat1 gyun6
Pinyin zī zī bù juàn

Definitions (CC-CEDICT)
  1. lit. diligent and never slacking (idiom); continuous concentrated effort
  2. assiduous (in study)
  3. to concentrate
Definitions (粵典–words.hk)
  1. 形容詞
    勤力​咁​教導​或者​學習
    to teach or study industriously
    • 佢孜孜不倦咁教育學生。
      佢孜孜不倦咁教育学生。
      keoi5 zi1 zi1 bat1 gyun6 gam2 gaau3 juk6 hok6 saang1
      He teaches students industriously.
  2. 參看
    孳孳不倦
Definitions (Wiktionary)
  1. phrase, idiomatic
    diligent; assiduous
Examples (粵典–words.hk)
  1. Cantonese
    佢孜孜不倦咁教育学生。
    佢孜孜不倦咁教育學生。
    keoi5 zi1 zi1 bat1 gyun6 gam2 gaau3 juk6 hok6 saang1
    • He teaches students industriously.