dredger
  疏濬機,挖泥船,採撈船
  Dredg·er n.
  1. One who fishes with a dredge.
  2. A dredging machine.
  Dredg·er, n. Cookery A box with holes in its lid; -- used for sprinkling flour, as on meat or a breadboard; -- called also dredging box, drudger, and drudging box.
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  dredger
       n : a barge or barge-like vessel used for dredging