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  1. Oxford American Dictionary

    plumb bob

    • IPA[ˈpləm ˌbäb]

    美式

    • n.
      a bob of lead or other heavy material forming the weight of a plumb line.

    • noun: plumb bob, plural noun: plumb bobs

    • 更多解釋

    plumb bob

    • n.
      a bob of lead or other heavy material forming the weight of a plumb line.

    Oxford Dictionary