殫ㄉㄢ精ㄐㄧㄥ竭ㄐㄧㄝˊ慮ㄌㄩˋdānjīng‑jiélǜ

简殚精竭虑

  1. 費盡精力和心思。例 「為解決技術難題而殫精竭慮」。

英to exhaust one's thoughts and ingenuity (idiom)​; to think sth through thoroughly, to rack one's brains, to leave no stone unturned
法concentrer toute son attention, déployer toutes les forces de son esprit
德sich den Kopf zerbrechen (S)​