殚精极虑殫精極慮

dān jīng jí lǜ

释义

to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly; to rack one's brains; to leave no stone unturned

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汉字

殚dānutmost, entirely, quite; to use up歹单精jīngessence, germ, spirit米青极jíextreme, top; final, furthest, utmost; pole木及虑lǜanxious, concerned, worried虍心