







tough problem
stubborn problem
intractable problem

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Open the tool →顽固的难题 (wán gù de nán tí) means “tough problem, stubborn problem, intractable problem”.
顽固的难题 is pronounced wán gù de nán tí in Mandarin Chinese.
“tough problem” is 顽固的难题 (wán gù de nán tí) in Chinese.