Taivo A Taiwan Mandarin dictionary

孜孜不倦

zīzībùjuàn

ㄗ ㄗ ㄅㄨˋ ㄐㄩㄢˋ

  1. 1lit. diligent and never slacking (idiom); continuous concentrated effort
  2. 2assiduous (in study)
  3. 3to concentrate

Keep 孜孜不倦 and it comes back until you know it.

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