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  1. a tough nut to crack

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

    Oxford American Dictionary

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

    Oxford Dictionary

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

    Oxford American Dictionary