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]