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1. Oxford Dictionary

   plumb rule

   • n.
     a plumb line attached to a board, used by builders and surveyors.

   • noun: plumb rule, plural noun: plumb rules

2. • 更多解釋

   plumb rule

   • IPA[ˈpləmˌro͞ol]

   美式

   • n.
     a plumb line attached to a board, used by builders and surveyors.

   Oxford American Dictionary