duplicate

• n.
  • something additional of the same kind

    同义词： extra

  • a copy that corresponds to an original exactly

    "he made a duplicate for the files"

    同义词： duplication

• v.
  • make or do or perform again

    同义词： reduplicate double repeat replicate

  • duplicate or match

    同义词： twin parallel

  • make a duplicate or duplicates of

    "Could you please duplicate this letter for me?"

  • increase twofold

    同义词： double

• adj.
  • identically copied from an original

    "a duplicate key"

  • being two identical

    同义词： matching twin(a) twinned

以上来源于: WordNet