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hueso duro de roer meaning in English

SpanishEnglish
hueso duro de roer noun
{m}

hard nut to crack(challenging problem to solve)
noun
[UK: hɑːd nʌt tuː kræk] [US: ˈhɑːrd ˈnət ˈtuː ˈkræk]

tough nut to crack(challenging problem to solve)
noun
[UK: tʌf nʌt tuː kræk] [US: ˈtəf ˈnət ˈtuː ˈkræk]