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dān jīng jí lǜ ㄉㄢ ㄐㄧㄥ ㄐㄧˊ

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Từ điển Trung-Anh

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