Read Edit View history 费尽心思 fèijìnxīnsi rack one's brains Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 费尽心思/費盡心思 · fèijìnxīnsi · rack one's brains 2026/03/04 费尽心思 / 費盡心思 fèijìnxīnsi rack one's brains to rack one's brains; to take great pains to think something through 为了解决这个问题，他费尽心思。 expression created sense Mar 4, 2026, 02:25 AM