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  1. cudgel one's brain (or brains)

    • ph.
      think hard about a problem
    • 相關詞
    • ph.
      think hard about a problem

    Oxford Dictionary

    • ph.
      think hard about a problem

    Oxford American Dictionary

    • 更多解釋
    • ph.
      think hard about a problem

    Oxford American Dictionary

  2. 知識+