coun·ter·part /-ˌpɑrt/
 副本,複本,配對物,相應物
 Coun·ter·part n.
 1. A part corresponding to another part; anything which answers, or corresponds, to another; a copy; a duplicate; a facsimile.
    In same things the laws of Normandy agreed with the laws of England, so that they seem to be, as it were, copies or counterparts one of another.   --Sir M. Hale.
 2. Law One of two corresponding copies of an instrument; a duplicate.
 3. A person who closely resembles another.
 4. A thing may be applied to another thing so as to fit perfectly, as a seal to its impression; hence, a thing which is adapted to another thing, or which supplements it; that which serves to complete or complement anything; hence, a person or thing having qualities lacking in another; an opposite.
 O counterpart
 Of our soft sex, well are you made our lords.   --Dryden.
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 counterpart
      n 1: a person or thing having the same function or
           characteristics as another [syn: opposite number, vis-a-vis]
      2: a duplicate copy [syn: similitude, twin]