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单词 signal box
释义

WordReference Random House Unabridged Dictionary of American English © 2024
signal box′, [Brit.]
  1. Rail Transport, British Termsa railway signal tower.
  • 1820–30

Collins Concise English Dictionary © HarperCollins Publishers::
signal box n
  1. a control point for a large area of a railway system, operated electrically and semiautomatically
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