Taivo A Taiwan Mandarin dictionary

用心良苦

yòngxīnliángkǔ

ㄩㄥˋ ㄒㄧㄣ ㄌㄧㄤˊ ㄎㄨˇ

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

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

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