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单词 fog signal
释义

WordReference Random House Unabridged Dictionary of American English © 2024
fog sig′nal, 
  1. Nautical, Naval Termsany of various types of signal used as a warning by vessels navigating in fog or mist.
  • 1750–60

Collins Concise English Dictionary © HarperCollins Publishers::
fog signal n
  1. a signal used to warn railway engine drivers in fog, consisting of a detonator placed on the line
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