资料来源 : pyDict

干线,中继线

资料来源 : Webster's Revised Unabridged Dictionary (1913)

   6. (Zo["o]l.)
      (a) The proboscis of an elephant.
      (b) The proboscis of an insect.

   7. A long tube through which pellets of clay, p?as, etc., are
      driven by the force of the breath.

            He shot sugarplums them out of a trunk. --Howell.

   8. A box or chest usually covered with leather, metal, or
      cloth, or sometimes made of leather, hide, or metal, for
      containing clothes or other goods; especially, one used to
      convey the effects of a traveler.

            Locked up in chests and trunks.       --Shak.

   9. (Mining) A flume or sluice in which ores are separated
      from the slimes in which they are contained.

   10. (Steam Engine) A large pipe forming the piston rod of a
       steam engine, of sufficient diameter to allow one end of
       the connecting rod to be attached to the crank, and the
       other end to pass within the pipe directly to the piston,
       thus making the engine more compact.

   11. A long, large box, pipe, or conductor, made of plank or
       metal plates, for various uses, as for conveying air to a
       mine or to a furnace, water to a mill, grain to an
       elevator, etc.

   {Trunk engine}, a marine engine, the piston rod of which is a
      trunk. See {Trunk}, 10.

   {Trunk hose}, large breeches formerly worn, reaching to the
      knees.

   {Trunk line}, the main line of a railway, canal, or route of
      conveyance.

   {Trunk turtle} (Zo["o]l.), the leatherback.

资料来源 : WordNet®

trunk line
     n 1: line that is the main route on a railway [syn: {trunk route}]
     2: a telephone line connecting two exchanges directly