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1. Oxford American Dictionary

   trunk line

   • IPA[ˈtrəNGk ˌlīn]

   美式

   • n.
     a main line of a railroad, telephone system, or other network.

   • noun: trunk line, plural noun: trunk lines

2. • 更多解釋

   trunk line

   • n.
     a main line of a railway, telephone system, or other network.

   Oxford Dictionary