mile·age /ˈmaɪlɪʤ/
 哩數


 Mile·age n.
 1. An allowance for traveling expenses at a certain rate per mile.
 2. Aggregate length or distance in miles; esp., the sum of lengths of tracks or wires of a railroad company, telegraph company, etc. [Written also milage.]
 Constructive mileage, a mileage allowed for journeys supposed to be made, but not actually made.

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 mileage
      n 1: distance measured in miles [syn: milage]
      2: the ratio of the number of miles traveled to the number of
         gallons of gasoline burned [syn: fuel consumption rate,
         gasoline mileage, gas mileage]
      3: a travel allowance at a given rate per mile traveled