Taivo A Taiwan Mandarin dictionary

費盡心思

fèijìnxīnsi

ㄈㄟˋ ㄐㄧㄣˋ ㄒㄧㄣ ˙ㄙ

Simplified 费尽心思

  1. 1to rack one's brains (idiom); to take great pains to think sth through

Keep 費盡心思 and it comes back until you know it.

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