por·ter·age /-tərɪʤ/
  搬運業
  Por·ter·age n.
  1. The work of a porter; the occupation of a carrier or of a doorkeeper.
  2. Money charged or paid for the carriage of burdens or parcels by a porter.
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  porterage
       n 1: the charge for carrying burdens by porters
       2: the transportation of burdens by porters