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单词 jacob's staff
释义

WordReference Random House Unabridged Dictionary of American English © 2024
Jacob's staff, pl. Jacob's staves. 
  1. Astronomycross-staff.
  2. Surveyinga pole providing a firm support for a compass or other instrument.
  • 1540–50

Collins Concise English Dictionary © HarperCollins Publishers::
Jacob's staff n
  1. a medieval instrument for measuring heights and distances
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更新时间:2025/7/23 8:12:55