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1. Oxford American Dictionary

   plumb line

   • IPA[ˈpləmˌlīn]

   美式

   • n.
     a line with a plumb attached to it, used for finding the depth of water or determining the vertical on an upright surface.

   • noun: plumb line, plural noun: plumb lines

2. • 更多解釋

   plumb line

   • IPA[ˈplʌmlʌɪn]

   英式

   • n.
     a line with a plumb attached to it, used for finding the depth of water or determining the ...

   Oxford Dictionary