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单词 plumb line
释义

WordReference Random House Unabridged Dictionary of American English © 2024
plumb line′, 
    1. Nautical, Surveying, Naval Termsa cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc. Cf. plumb (def. 1).
    2. Surveying, BuildingSee plumb rule. 
    • 1530–40

Collins Concise English Dictionary © HarperCollins Publishers::
plumb line n
  1. a string with a metal weight at one end that, when suspended, points directly towards the earth's centre of gravity and so is used to determine verticality, the depth of water, etc
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