殫精極慮

dan1 jing1 ji2 lu:4

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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殫精極慮|殚精极虑 [dān jīng jí lu] ► to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly ► to rack one's brains ► to leave no stone unturned