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1. Oxford American Dictionary

   a tough nut to crack

   • ph.
     a difficult problem or an opponent that is hard to beat
2. • 相關詞

   a tough (or hard) nut to crack

   • ph.
     a difficult problem or an opponent that is hard to beat

   Oxford American Dictionary

   a tough (or hard) nut to crack

   • ph.
     a difficult problem or an opponent that is hard to beat

   Oxford Dictionary

3. • 更多解釋

   a tough nut to crack

   • ph.
     a difficult problem or an opponent that is hard to beat

   Oxford Dictionary