Yahoo奇摩字典 網頁搜尋

  1. collar beam

    • n.
      a horizontal piece of squared timber connecting two rafters and forming with them an A-shaped roof truss.
    • noun: collar beam, plural noun: collar beams

    • 更多解釋
    • IPA[ˈkälər bēm]
    • n.
      a horizontal wooden joist or beam connecting two rafters and forming with them an A-shaped roof ...

    Oxford American Dictionary