grater
  擦子;磨碎的人
  Grat·er a.  One who, or that which, grates; especially, an instrument or utensil with a rough, indented surface, for rubbing off small particles of any substance; as a grater for nutmegs.
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  grater
       n : utensil with sharp perforations for shredding foods (as
           vegetables or cheese)