Taivo A Taiwan Mandarin dictionary

良苦用心

liángkǔyòngxīn

ㄌㄧㄤˊ ㄎㄨˇ ㄩㄥˋ ㄒㄧㄣ

  1. 1to ponder earnestly
  2. 2to give a lot of thought to sth

Keep 良苦用心 and it comes back until you know it.

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