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  1. portal frame

    • n.
      a rigid structural frame consisting essentially of two uprights connected at the top by a third member.
    • noun: portal frame, plural noun: portal frames

    • 更多解釋
    • IPA[ˈpôrdl frām]
    • n.
      a rigid structural frame consisting essentially of two uprights connected at the top by a third ...

    Oxford American Dictionary