duo /ˈdu(ˌ)o ||ˈdju-/
  二重唱
  Du·o n.  Mus. A composition for two performers; a duet.
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  duo
       n 1: two items of the same kind [syn: couple, pair, twosome,
             twain, brace, span, yoke, couplet, distich,
             duet, dyad, duad]
       2: two performers or singers who perform together [syn: duet,
           duette]
       3: a pair who associate with one another; "the engaged couple";
          "an inseparable twosome" [syn: couple, twosome, duet]
       4: a musical composition for two performers [syn: duet, duette]
       [also: dui (pl)]