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  1. let fall

    • ph.
      draw (a perpendicular) from an outside point to a line
    • 相關詞
    • ph.
      casually reveal a piece of information

    Oxford American Dictionary

    • ph.
      casually reveal a piece of information

    Oxford Dictionary

    • 更多解釋
    • ph.
      draw (a perpendicular) from an outside point to a line

    Oxford Dictionary

  2. 知識+