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单词 backsight
释义

WordReference Random House Unabridged Dictionary of American English © 2024
back•sight  (baksīt′),USA pronunciation n. [Survey.]
  1. Surveyinga sight on a previously occupied instrument station.
  2. Surveying(in leveling) the reading on a rod that is held on a point of known elevation, used in computing the elevation of the instrument.
  • back2 + sight 1840–50

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