trio /ˈtri(ˌ)o/
 三重唱


 Tri·o n.
 1. Three, considered collectively; three in company or acting together; a set of three; three united.
    The trio were well accustomed to act together, and were linked to each other by ties of mutual interest.   --Dickens.
 2. Mus. (a) A composition for three parts or three instruments. (b) The secondary, or episodical, movement of a minuet or scherzo, as in a sonata or symphony, or of a march, or of various dance forms; -- not limited to three parts or instruments.

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 trio
      n 1: the cardinal number that is the sum of one and one and one
           [syn: three, 3, III, threesome, tierce, leash,
            troika, triad, trine, trinity, ternary, ternion,
            triplet, tercet, terzetto, trey, deuce-ace]
      2: a musical composition for three performers
      3: three performers or singers who perform together
      4: a set of three similar things considered as a unit [syn: triad,
          triplet]
      5: three people considered as a unit [syn: threesome, triad,
          trinity]