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单词 trunk line
释义

WordReference Random House Unabridged Dictionary of American English © 2024
trunk line′, 
    1. Transporta major long-distance transportation line.
    2. Telecommunicationstrunk (def. 8).
    • 1850–55

Collins Concise English Dictionary © HarperCollins Publishers::
trunk line n
  1. a direct link between two telephone exchanges or switchboards that are a considerable distance apart
  2. the main route or routes on a railway
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