dock·age /ˈdɑkɪʤ/
  船塢使用費;入塢;扣除
  Dock·age n. A charge for the use of a dock.
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  dockage
       n 1: a fee charged for a vessel to use a dock [syn: docking fee]
       2: landing in a harbor next to a pier where ships are loaded
          and unloaded or repaired; may have gates to let water in
          or out; "the ship arrived at the dock more than a day
          late" [syn: dock, docking facility]